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.