A Theremin?

[Eldritch_of_Fire]

http://youtube.com/watch?v=nJYho56INKU&amp...ted&search= (http://youtube.com/watch?v=nJYho56INKU&mode=related&search=)

Ever since I saw that thing I was wondering how does it work? :shock:
Reminds me of the holophoner from Futurama lol.

[kage]

it has to do with electrical fields. apparently, moving your hands around changes the electrical fields.

http://en.wikipedia.org/wiki/Theremin#Operating_principles