This new video from Jack White shows frequency and resonance through paint reverberating inside a speakers. Very cool!
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I don’t see any amps?
From the way some of that goop’s moving I suspect it might be coloured oobleck rather than just paint. See: http://www.youtube.com/watch?v=3zoTKXXNQIU for a nice example of non-Newtonian oddness.
Looks like a non-newtonian fluid rather than paint. My guess is ooblek (cornstarch and water). Very cool though.