Most awesomist instrument ever: The ANS Synthesizer (Синтезатор АНС)
Video of a live performance: http://youtu.be/gM4O593Pzm4?t=5m11s And — yes! — there’s an app for that: http://createdigitalmusic.com/2013/10/ans-amazing-eerie-russian-optical-synth-now-ios-links-links-vids/