The Nao-Min is one of the more unique instruments that I have come across. The sound is very Theremin-like and the controls are really clever. Check out the video below for more about how the Nao-Min works.

And some more detailed video of how it works:

A little more about Musical gadget: Nao-Min

In the Maker Shed:
Makershedsmall

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555 Noisemusick Kit