Category Archives: fashion

Future sex, gender and relationships: how close can you get?

Using robots for gender play

Using robots for gender play

I recently gave a public talk at the British Academy about future sex, gender, and relationship, asking the question “How close can you get?”, considering particularly the impact of robots. The above slide is an example. People will one day (between 2050 and 2065 depending on their budget) be able to use an android body as their own or even swap bodies with another person. Some will do so to be young again, many will do so to swap gender. Lots will do both. I often enjoy playing as a woman in computer games, so why not ‘come back’ and live all over again as a woman for real? Except I’ll be 90 in 2050.

The British Academy kindly uploaded the audio track from my talk at

If you want to see the full presentation, here is the PowerPoint file as a pdf:


I guess it is theoretically possible to listen to the audio while reading the presentation. Most of the slides are fairly self-explanatory anyway.

Needless to say, the copyright of the presentation belongs to me, so please don’t reproduce it without permission.


Colour changing cars, everyday objects and makeup shows how graphene can be used to make displays with each pixel changing colour according to mechanical deformation.

Meanwhile, Lexus have just created a car with a shell covered in LEDs so it can act as a massive display.

In 2014 I wrote about using polymer LED displays for future Minis so it’s nice to see another prediction come true.

Looking at the mechanical pixels though, it is clear that mechanical pixels could respond directly to sound, or to turbulence of passing air, plus other vibration that arises from motion on a road surface, or the engine. Car panel colours could change all the time powered by ambient energy. Coatings on any solid objects could follow, so people might have plenty of shimmering colours in their everyday environment. Could. Not sure I want it, but they could.

With sound as a control system, sound wave generators at the edges or underneath such surfaces could produce a wide variety of pleasing patterns. We could soon have furniture that does a good impression of being a cuttlefish.

I often get asked about smart makeup, on which I’ve often spoken since the late 90s. Thin film makeup displays could use this same tech. So er, we could have people with makeup pretending to be cuttlefish too. I think I’ll quit while I’m ahead.

Future Augmented Reality

AR has been hot on the list of future IT tech for 25 years. It has been used for various things since smartphones and tablets appeared but really hit the big time with the recent Pokemon craze.

To get an idea of the full potential of augmented reality, recognize that the web and all its impacts on modern life came from the convergence of two medium sized industries – telecoms and computing. Augmented reality will involve the convergence of everything in the real world with everything in the virtual world, including games, media, the web, art, data, visualization, architecture, fashion and even imagination. That convergence will be enabled by ubiquitous mobile broadband, cloud, blockchain payments, IoT, positioning and sensor tech, image recognition, fast graphics chips, display and visor technology and voice and gesture recognition plus many other technologies.

Just as you can put a Pokemon on a lawn, so you could watch aliens flying around in spaceships or cartoon characters or your favorite celebs walking along the street among the other pedestrians. You could just as easily overlay alternative faces onto the strangers passing by.

People will often want to display an avatar to people looking at them, and that could be different for every viewer. That desire competes with the desire of the viewer to decide how to see other people, so there will be some battles over who controls what is seen. Feminists will certainly want to protect women from the obvious objectification that would follow if a woman can’t control how she is seen. In some cases, such objectification and abuse could even reach into hate crime territory, with racist, sexist or homophobic virtual overlays. All this demands control, but it is far from obvious where that control would come from.

As for buildings, they too can have a virtual appearance. Virtual architecture will show off architect visualization skills, but will also be hijacked by the marketing departments of the building residents. In fact, many stakeholders will want to control what you see when you look at a building. The architects, occupants, city authorities, government, mapping agencies, advertisers, software producers and games designers will all try to push appearances at the viewer, but the viewer might want instead to choose to impose one from their own offerings, created in real time by AI or from large existing libraries of online imagery, games or media. No two people walking together on a street would see the same thing.

Interior decor is even more attractive as an AR application. Someone living in a horrible tiny flat could enhance it using AR to give the feeling of far more space and far prettier decor and even local environment. Virtual windows onto Caribbean beaches may be more attractive than looking at mouldy walls and the office block wall that are physically there. Reality is often expensive but images can be free.

Even fashion offers a platform for AR enhancement. An outfit might look great on a celebrity but real life shapes might not measure up. Makeovers take time and money too. In augmented reality, every garment can look as it should, and that makeup can too. The hardest choice will be to choose a large number of virtual outfits and makeups to go with the smaller range of actual physical appearances available from that wardrobe.

Gaming is in pole position, because 3D world design, imagination, visualization and real time rendering technology are all games technology, so perhaps the biggest surprise in the Pokemon success is that it was the first to really grab attention. People could by now be virtually shooting aliens or zombies hoarding up escalators as they wait for their partners. They are a little late, but such widespread use of personal or social gaming on city streets and in malls will come soon.

AR Visors are on their way too, and though the first offerings will be too expensive to achieve widespread adoption, cheaper ones will quickly follow. The internet of things and sensor technology will create abundant ground-up data to make a strong platform. As visors fall in price, so too will the size and power requirements of the processing needed, though much can be cloud-based.

It is a fairly safe bet that marketers will try very hard to force images at us and if they can’t do that via blatant in-your-face advertising, then product placement will become a very fine art. We should expect strong alliances between the big marketing and advertising companies and top games creators.

As AI simultaneously develops, people will be able to generate a lot of their own overlays, explaining to AI what they’d like and having it produced for them in real time. That would undermine marketing use of AR so again there will be some battles for control. Just as we have already seen owners of landmarks try to trademark the image of their buildings to prevent people including them in photographs, so similar battles will fill the courts over AR. What is to stop someone superimposing the image of a nicer building on their own? Should they need to pay a license to do so? What about overlaying celebrity faces on strangers? What about adding multimedia overlays from the web to make dull and ordinary products do exciting things when you use them? A cocktail served in a bar could have a miniature Sydney fireworks display going on over it. That might make it more exciting, but should the media creator be paid and how should that be policed? We’ll need some sort of AR YouTube at the very least with added geolocation.

The whole arts and media industry will see city streets as galleries and stages on which to show off and sell their creations.

Public services will make more mundane use of AR. Simple everyday context-dependent signage is one application, but overlays would be valuable in emergencies too. If police or fire services could superimpose warning on everyone’s visors nearby, that may help save lives in emergencies. Health services will use AR to assist ordinary people to care for a patient until an ambulance arrives

Shopping provide more uses and more battles. AR will show you what a competing shop has on offer right beside the one in front of you. That will make it easy to digitally trespass on a competitor’s shop floor. People can already do that on their smartphone, but AR will put the full image large as life right in front of your eyes to make it very easy to compare two things. Shops won’t want to block comms completely because that would prevent people wanting to enter their shop at all, so they will either have to compete harder or find more elaborate ways of preventing people making direct visual comparisons in-store. Perhaps digital trespassing might become a legal issue.

There will inevitably be a lot of social media use of AR too. If people get together to demonstrate, it will be easier to coordinate them. If police insist they disperse, they could still congregate virtually. Dispersed flash mobs could be coordinated as much as ones in the same location. That makes AR a useful tool for grass-roots democracy, especially demonstrations and direct action, but it also provides a platform for negative uses such as terrorism. Social entrepreneurs will produce vast numbers of custom overlays for millions of different purposes and contexts. Today we have tens of millions of websites and apps. Tomorrow we will have even more AR overlays.

These are just a few of the near term uses of augmented reality and a few hints as issues arising. It will change every aspect of our lives in due course, just as the web has, but more so.


Future sex, gender and design

This is a presentation I made for the Eindhoven Design Academy. It is mostly self-explanatory


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Pubic fashion and the Internet-of-genitalia

Not for the easily offended, or my parents, who do read my blog sometimes, but hopefully not this one. This is another extract from my forthcoming book on future fashion. No sector is immune to futurology.

The pubic area may not be talked about much in fashion articles, but it is suited to fashion as any other. Pubic hairstyles (including bald) vary from person to person and over time, but they certainly do get fashion consideration. Vajazzling, decorating the female pubic area with stick-on glitter, has also had its limelight as a fashion thing, Beautifying and styling the pubic area is here to stay for as long as casual sex remains common. If an area gets attention, people will want to make it look sexier or more interesting or enticing, so it is just another platform for personal expression, as much as choice of underwear.

Updating stick-on glitter to LEDs or lasers could make a whole light show down there. This could of course tap into data from sensors that pick up on sexual activity and arousal level. That would allow a direct feedback route on performance. Whoever is pleasuring her could see the results echoed in a visual response in local LEDs or flashing glitter or laser beams. That would be fun, but it could use audio too. Since the pubic region is fairly flat and firm, it also presents a potential surface for flat speakers to generate sound effects or music during sex, again linked to arousal sensor feedback. Of course, speakers are another form of vibration device too so they might also take an active role in stimulation.

Hair management already uses lasers to kill hair follicles, but some women regret having their pubic areas completely depilated, and are now having hair implanted back. As hair styles come and go, what is needed is a better trimming and shaving system. I am surprised the shaver industry has not already picked up on this possibility, (if it has I am not aware of it) but a design could be rendered much better if the shaver can access a local positioning system. If a person sticks on a few tiny transmitters, reflectors or transponders in specific places near the trimming zone, the shaver head would know its exact position and orientation and would be able to trim that specific area precisely as dictated by the chosen pattern. Automated precision hair styles would be feasible without taking too much time. Another cheap and easy way of doing this would be to spray a marker pattern through a stencil and have the shaver trim the areas marked.

Naturally, such shaver technology would also be useful for other areas such as the head or chest (for men anyway, I don’t expect female chest hair to be a significant fashion trend any time soon), or to replace waxing anywhere on the body with precision patterns and trims.

Many people are unhappy with their actual genitalia. Re-scuplting, trimming, tightening, or changing size is becoming common. Gender re-assignment surgery is also growing, but gender-change and gender-play fashion needs a whole section for itself, and I’ve written about it before anyway(my most popular post ever in fact) :

Not in the pubic area, but somewhat related  to this topic nonetheless, here is a quick consideration of smart breast implants:

[Smart breast implants

Smart breast implants are one of my best inventions – the only one for which I have ever received a prize. The idea was that if a woman is determined to expand her breasts by putting stuff into them, why not put electronics in? In fact, electronics can be made using silicone, one of the main breast implant materials. It won’t work as fast as silicon-based IT but it will do fine for things like MP3 players (MP4 now of course). A range of smartphone-style functions could be added as well as music playing. For example, navigation could link location and maps to vibrating nipples to indicate left or right. I suggested using nipples as control knobs for my MP3 implants, and that is perfectly feasible. Detectors in the implant could easily detect torsion and interpret the tweaks. Implants would be able to monitor some biological functions more precisely than wristbands. Heartbeat and breathing could be audio recorded far better for example.

Shape changing breast implants

I often cite polymer gel muscles in fashion, because they are so useful. Contracting when a voltage is applied across them, but made of electro-active polymer so they feel organic, they are ideal for many purposes in and on the body for extra strength of for changing shapes or orientation. Breast implants could contain strands of such gel, arranged so that the shape of the implant can be altered. They could be adjusted to change breast shape, improve lift or cleavage, and relaxed when no-one is looking.

Pectoral implants already give some men the appearance of being more muscular and fit. Adding actual strength using polymer gel muscles rather than simple padding would be a lot better.


Shape change materials could also be used in bras of course, allowing control to be varied by an app. A single bra could work for general and sports use for example. Similarly, hydraulic bras could give extra lift or control by inflating tubes with compressed air. Staying with inflation, of course the bra as a whole could be inflated to give the illusion of larger size.

Bras can incorporate energy harvesting for use while running. A suitable material could be plastic capacitors, which make electricity directly as they flex.

Nipple-tapes could be coupled to vibrators for a slightly more immersive sexual experience, and remote controlled for more kinky play.]

Now, back to the pubic area.

Rather along the same lines as smart breast implants, if someone is going to the lengths of having genital surgery and particularly if implants are involved, then electronic implants could be a useful consideration. Some devices use electrical stimulation, applying particular patterns of voltages and currents to create, magnify and sustain arousal. Devices could be implanted to do exactly this. They could be access restricted to the wearer, controlled by a dominant or even networked for remote control, by any chosen individual or group. MEMS or sensors could also be implanted to create vibration or to measure arousal.

Sensors can easily detect moisture levels, skin resistance, blood flow, blood oxygen levels, heart rate, breathing and so on. These together can indicate a great deal about arousal state and that can be fed back into stimulation system to maximise pleasure. Stimulation devices could provide direct stimulation or work along with external devices such as vibrators, controlling their behavior according to location and sensor feedback. Vibrators shouldn’t need control knobs that distract their users, but should automatically adjust their behavior according to the region they are stimulating and the user’s  arousal profile, changing stimulation throughout the session according to programs and recorded routines stored in the cloud. Shared toys could use fingerprint recognition or implanted RFID chips, but I think that would usually be considered to be going too far. 

An important fashion consideration is that visual appearance can mostly be decoupled from function. Electronics can be shrunk to vanishingly small size and fit in the tiniest of sensors or actuators. Genital and pubic electronics can therefore be visually appealing at the same time as providing a full suite of functionality.

Shape change materials such as electro-active polymers can also be implanted. These could also be used to generate vibration by varying applied voltage patterns appropriately. Shape changing implants could be used to vary tightness during penetration, or to make features more appealing during foreplay.

As with the pubic area as a whole, genitals could also incorporate visual feedback using color change, LEDS or even music or other sound effects according to arousal state. Sound is better generated by pubic speakers though as surfaces are more cooperative to engineering.

Clearly, with a number of feedback and bio-sign monitoring sensors, MEMS, speaker systems, illumination, decoration and visual effects systems, the whole pubic and genital region is a potentially large electronics ecosystem, and we will need a whole branch of IoT technology, which could be termed ‘Internet of genitalia’.

The future of fashion: hair waves

I don’t do hair. I shave my head to 3mm every month or so, and never let it grow long., but I watch telly and observe that very many women use hair extensions and wigs, and I spot a high voltage technology opportunity.

Remember the Van der Graff generator in your school physics lab? It makes a high voltage than makes your hair stand up. When you finally touch something, the tiny charge involved dissipates and gives you a tiny shock.

So, suppose you are a wig manufacturer, making a wig with fine filaments, or hair I guess. You add a base layer of circuitry, ideally separated from your scalp by an insulating layer. You design the circuits so that you can apply specific voltages individually to any region of the hair, and you design a nice algorithm to move those voltages around in patterns, so that patches of hair stand up, fall down, and overall the effect is dynamic patterns such as waves all over your head. Hair will be mobile.

Total charge doesn’t need to change much, mainly just be moved around, so battery drain would be OK, and the power supply could be hidden in a collar or shoulder pad.

Hair patterns could even adopt fashion language, used for secret tribal signalling, and internet of hair will be needed. It is also capable of misuse and another potential signalling path to guard against in casinos.

It would also be trivially easy to monitor your emotional state, or even thought recognition, and have you hair respond and illustrate your emotions. So when you think “shock, horror”, you hair would actually stand on end 🙂

Well, you get the idea. Fun! And you read it here first.

Shoulder demons and angels

Remember the cartoons where a character would have a tiny angel on one shoulder telling them the right thing to do, and a little demon on the other telling them it would be far more cool to be nasty somehow, e.g. get their own back, be selfish, greedy. The two sides might be ‘eat your greens’ v ‘the chocolate is much nicer’, or ‘your mum would be upset if you arrive home late’ v ‘this party is really going to be fun soon’. There are a million possibilities.

Shoulder angels

Shoulder angels

Enter artificial intelligence, which is approaching conversation level, and knows the context of your situation, and your personal preferences etc, coupled to an earpiece in each ear, available from the cloud of course to minimise costs. If you really insisted, you could make cute little Bluetooth angels and demons to do the job properly.

In fact Sony have launched Xperia Ear, which does the basic admin assistant part of this, telling you diary events etc. All we need is an expansion of its domain, and of course an opposing view. ‘Sure, you have an appointment at 3, but that person you liked is in town, you could meet them for coffee.’

The little 3D miniatures could easily incorporate the electronics. Either you add an electronics module after manufacture into a small specially shaped recess or one is added internally during printing. You could have an avatar of a trusted friend as your shoulder angel, and maybe one of a more mischievous friend who is sometimes more fun as your shoulder demon. Of course you could have any kind of miniature pets or fictional entities instead.

With future materials, and of course AR, these little shoulder accessories could be great fun, and add a lot to your overall outfit, both in appearance and as conversation add-ons.

Digital Halos

I enjoyed watching a few seconds of the Lady Gaga video from the Grammy’s where Intel used a projection system to display a spider crawling around her face along with Bowie images. State of the art today is dirt cheap tomorrow. So soon everyone will be doing that, projecting images and videos onto their faces. They will do that to look like other people too, as Gaga hinted. I do like Gaga. She may not have the advantage of being born the prettiest singer ever but she makes up for that 100-fold by her creativity and pushing boundaries in every way she can and making good use of tech. I love her music too.

I’ve written about digital or smart makeup lots of times so i won’t do that here. But another idea that springs to mind is the digital halo.

Some fog generators use water and ultrasonic transducers to create a fine mist, the sort of thing you see on indoor water features where fog tumbles down the ornament. Of course, some come with a bank of LEDs, because they can, and that makes pretty colors too. At least one trade show projection system uses a fine mist as a 3D projection medium too. Put these together, and you have the capability to make a fine mist around your head and project images onto it. I blogged that idea quite a while ago as a Star Wars projection in front of you, but imagine doing this as a sort of halo, a mist that surrounds your head and immerses it in visual effects. You could project a halo if you so desire, and it could be a single whitish color as tradition dictates, changing colors, patterns or images, or you could do the full thing and go for a full-blown video spectacular, and – haute to Family Guy –  you could accompany it with your personal theme too.

Taste seemingly has few boundaries, and it is frequently obvious that the lower echelons of bad taste often offer the greatest rewards. So I am confident that we will soon see people sporting the most hideously garish digital halos.

How to make a Star Wars light saber

A couple of years ago I explained how to make a free-floating combat drone: , like the ones in Halo or Mass Effect. They could realistically be made in the next couple of decades and are very likely to feature heavily in far future warfare, or indeed terrorism. I was chatting to a journalist this morning about light sabers, another sci-fi classic. They could also be made in the next few decades, using derivatives of the same principles. A prototype is feasible this side of 2050.

I’ll ignore the sci-fi wikis that explain how they are meant to work, which mostly approximate to fancy words for using magic or The Force and various fictional crystals. On the other hand, we still want something that will look and sound and behave like the light saber.

The handle bit is pretty obvious. It has to look good and contain a power source and either a powerful laser or plasma generator. The traditional problem with using a laser-based saber is that the saber is only meant to be a metre long but laser beams don’t generally stop until they hit something. Plasma on the other hand is difficult to contain and needs a lot of energy even when it isn’t being used to strike your opponent. A laser can be switched on and off and is therefore better. But we can have some nice glowy plasma too, just for fun.

The idea is pretty simple then. The blade would be made of graphene flakes coated with carbon nanotube electron pipes, suspended using the same technique I outlined in the blog above. These could easily be made to form a long cylinder and when you want the traditional Star Wars look, they would move about a bit, giving the nice shimmery blurry edge we all like so that the tube looks just right with blurry glowy edges. Anyway, with the electron pipe surface facing inwards, these flakes would generate the internal plasma and its nice glow. They would self-organize their cylinder continuously to follow the path of the saber. Easy-peasy. If they strike something, they would just re-organize themselves into the cylinder again once they are free.

For later models, a Katana shaped blade will obviously be preferred. As we know, all ultimate weapons end up looking like a Katana, so we might as well go straight to it, and have the traditional cylindrical light saber blade as an optional cosmetic envelope for show fights. The Katana is a universal physics result in all possible universes.

The hum could be generated by a speaker in the handle if you have absolutely no sense of style, but for everyone else, you could simply activate pulsed magnetic fields between the flakes so that they resonate at the required band to give your particular tone. Graphene flakes can be magnetized so again this is perfectly consistent with physics. You could download and customize hums from the cloud.

Now the fun bit. When the blade gets close to an object, such as your opponent’s arm, or your loaf of bread in need of being sliced, the capacitance of the outer flakes would change, and anyway, they could easily transmit infrared light in every direction and pick up reflections. It doesn’t really matter which method you pick to detect the right moment to activate the laser, the point is that this bit would be easy engineering and with lots of techniques to pick from, there could be a range of light sabers on offer. Importantly, at least a few techniques could work that don’t violate any physics. Next, some of those self-organizing graphene flakes would have reflective surface backings (metals bond well with graphene so this is also a doddle allowed by physics), and would therefore form a nice reflecting surface to deflect the laser beam at the object about to be struck. If a few flakes are vaporized, others would be right behind them to reflect the beam.

So just as the blade strikes the surface of the target, the powerful laser switches on and the beam is bounced off the reflecting flakes onto the target, vaporizing it and cauterizing the ends of the severed blood vessels to avoid unnecessary mess that might cause a risk of slipping. The shape of the beam depends on the locations and angles of the reflecting surface flakes, and they could be in pretty much any shape to create any shape of beam needed, which could be anything from a sharp knife to a single point, severing an arm or drilling a nice neat hole through the heart. Obviously, style dictates that the point of the saber is used for a narrow beam and the edge is used as a knife, also useful for cutting bread or making toast (the latter uses transverse laser deflection at lower aggregate power density to char rather than vaporize the bread particles, and toast is an option selectable by a dial on the handle).

What about fights? When two of these blades hit each other there would be a variety of possible effects. Again, it would come down to personal style. There is no need to have any feel at all, the beams could simple go through each other, but where’s the fun in that? Far better that the flakes also carry high electric currents so they could create a nice flurry of sparks and the magnetic interactions between the sabers could also be very powerful. Again, self organisation would allow circuits to form to carry the currents at the right locations to deflect or disrupt the opponent’s saber. A galactic treaty would be needed to ensure that everyone fights by the rules and doesn’t cheat by having an ethereal saber that just goes right through the other one without any nice show. War without glory is nothing, and there can be no glory without a strong emotional investment and physical struggle mediated by magnetic interactions in the sabers.

This saber would have a very nice glow in any color you like, but not have a solid blade, so would look and feel very like the Star Wars saber (when you just want to touch it, the lasers would not activate to slice your fingers off, provided you have read the safety instructions and have the safety lock engaged). The blade could also grow elegantly from the hilt when it is activated, over a second or so, it would not just suddenly appear at full length. We need an on/off button for that bit, but that could simply be emotion or thought recognition so it turns on when you concentrate on The Force, or just feel it.

The power supply could be a battery or graphene capacitor bank of a couple of containers of nice chemicals if you want to build it before we can harness The Force and magic crystals.

A light saber that looks, feels and behaves just like the ones on Star Wars is therefore entirely feasible, consistent with physics, and could be built before 2050. It might use different techniques than I have described, but if no better techniques are invented, we could still do it the way I describe above. One way or another, we will have light sabers.


The future of nylon: ladder-free hosiery

Last week I outlined the design for a 3D printer that can print and project graphene filaments at 100m/s. That was designed to be worn on the wrist like Spiderman’s, but an industrial version could print faster. When I checked a few of the figures, I discovered that the spinnerets for making nylon stockings run at around the same speed. That means that graphene stockings could be made at around the same speed. My print head produced 140 denier graphene yarn but it made that from many finer filaments so basically any yarn thickness from a dozen carbon atoms right up to 140 denier would be feasible.

The huge difference is that a 140 denier graphene thread is strong enough to support a man at 2g acceleration. 10 denier stockings are made from yarn that breaks quite easily, but unless I’ve gone badly wrong on the back of my envelope, 10 denier graphene would have roughly 10kg (22lb)breaking strain. That’s 150 times stronger than nylon yarn of the same thickness.

If so, then that would mean that a graphene stocking would have incredible strength. A pair of 10 denier graphene stockings or tights (pantyhose) might last for years without laddering. That might not be good news for the nylon stocking industry, but I feel confident they would adapt easily to such potential.

Alternatively, much finer yarns could be made that would still have reasonable ladder resistance, so that would also affect the visual appearance and texture. They could be made so fine that the fibers are invisible even up close. People might not always want that, but the key message is that wear-resistant, ladder free hosiery could be made that has any gauge from 0.1 denier to 140 denier.

There is also a bonus that graphene is a superb conductor. That means that graphene fibers could be woven into nylon hosiery to add circuits. Those circuits might be to harvest radio energy, act as an aerial, power LEDS in the hosiery or change its colors or patterns. So even if it isn’t used for the whole garment, it might still have important uses in the garment as an addition to the weave.

There is yet another bonus. Graphene circuits could allow electrical supply to shape changing polymers that act rather like muscles, contracting when a voltage is applied across them, so that a future pair of tights could shape a leg far better, with tensions and pressures electronically adjusted over the leg to create the perfect shape. Graphene can make electronic muscles directly too, but in a more complex mechanism (e.g. using magnetic field generation and interaction, or capacitors and electrical attraction/repulsion).