On: Making physical music worth buying: CD case includes theremin-like instrument

[mhb]

Picky, and it looks like the post's title writer (but not gizmodo's) realized this, but it's not exactly a theremin: http://en.wikipedia.org/wiki/Theremin

[endtime → mhb]

Yep, that was me. In case anyone's wondering what the difference is, theremins don't use light sensors (or whatever the technical term is; I'm CS, not EE) but something that detects proxmity.

[andreyf → endtime]

Oi! You are not CS just because you are studying it :-P It's pretty basic electromagnetism, see: http://en.wikipedia.org/wiki/Theremin#Operating_principles