Theremin

For anyone interested, have a look at this dedicated website http://theremin.info/ there are many others as well....
To have some fun, go here http://www.bbc.co.uk/science/playground/theremin1.shtml and download the Simulator

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Willum

Willum, I remember seeing a demonstration of an instrument of this sort way back in the mid 1950's in a school assembly. The operator just waved his hands around to make weird sounds that didn't seem like music to me. That was the only time I've seen this goofy thing. I reckon I haven't missed anything.