Okay, some physics maven please explain this to me, and also why a few of the patterns formed by the sand are asymmetrical. (I haven’t looked up the Chladni plate experiment.)
From io9, where the notes say this:
Stop what you’re doing and watch this. It’s a video of sand. Sand skittering around on a vibrating plate, to be exact. But what happens when that sand skitters is amazing. Trust us – this is something you want to see.
What you’re watching is the Chladni plate experiment, as performed by YouTube science-and-illusion wizard Brusspup (he can also coax water into a zig-zagging stream, and make Rubik’s Cubes that aren’t Rubik’s Cubes).
Oh, and as a special treat—because you’re good enough, you’re smart enough, and doggonit, people like you—here’s the Rubik’s cube illusion and other anamorphic illusions mentioned above. Be sure to watch for the felid at the end: