> looking at grains of salt

"Salt actually comes in several different kinds of shapes. Refined salt, commonly called "table salt," is fairly regular in shape, because it has been through several machines before it was packaged, and in order to make it easy to pour or shake, the grains are sort of rounded. Then there is rock salt, which is in irregular chunks. We could hit a couple chunks of rock salt with a hammer, and get a more natural shape of granule. Kosher salt is sea salt, and the grains are somewhat squared."

Not far off 'vaguely cubical', hey!

By the way, the third part of the film thriller series which started with 'Cube', then 'Hypercube', is running in theatres. Its title? - Cube Zero