I bet on http://en.wikipedia.org/wiki/Faraday_wave http://en.wikipedia.org/wiki/Faraday_wave : The waves can take the form of stripes, close-packed hexagons, or

I bet on http://en.wikipedia.org/wiki/Faraday_wave http://en.wikipedia.org/wiki/Faraday_wave : The waves can take the form of stripes, close-packed hexagons, or even squares or quasiperiodic patterns. See also http://nanopatentsandinnovations.blogspot.de/2012/11/new-type-of-gravity-wave-has-shape-of.html http://nanopatentsandinnovations.blogspot.de/2012/11/new-typ...