Wow, that is awesome! No, I haven't seen it before, despite having calculated it extensively by hand... The rice I presume is settling in the nodes - that is, where the material tends to vibrate less and appear to stand still, as if it were elsewhere it would get bounced around. Really cool. ^_^
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This is less cool, and you've probably seen it in real life, but I always like seeing it again:
http://www.youtube.com/watch?v=nO0bSSXmr1A
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