A few days ago, a viral video surfaced which appeared to show a functional model of M.C. Escher's famous drawing "Waterfall". How does it work? Boing Boing reader David Goldman proposes the above explanation. Do you agree?
via Boing Boing
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I think that David's solution doesn't hold up, if built the shadows wouldn't match.
a) There is a piece or plastic/plexiglass just above the wood's surface.
b) The bottom "ramp" is actually stepped or sloped down from where the water is poured in front of the wheel.
c) The water enters the plastic/wood channel via gravity and then moves up the other slopes by capillary action. The pressure at the entry point by the wheel is greater than the pull of gravity on the water. It would readily flow up and out of the "top" where the pressure is lower.
d) The structure is a bit of an optical illusion as I don't believe the slopes are as steep as they appear, and it is shot from a very particular angle.
At least that's my guess.