The concept of Sousveilance: https://en.wikipedia.org/wiki/Sousveillance

You are data! (using your cell phone) http://www.wired.com/design/2013/08/how-a-startups-cheap-sensors-could-bring-shopping-and-mobile-computing-into-the-future/

Interaction reading electrical signals: https://www.thalmic.com/en/myo/

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