This little interaction was developed around a year ago. Go and dance your self: www.etterstudio.com/lab/mouse/

PS: What's quite interesting about this interaction is that the brain can control the mirrored mouse movements after practising for about a minute.

Inspired by the work of Johnny Lee we've tried to develop a similar thing, using the webcam. It is completely useless, but was fun to do.

You need a webcam pointing towards your head, wait till images are loaded, move your head left/right: www.etterstudio.com/lab/tracking/