Those are damn cool!
Now, if only the maker would design some d4s as stained-glass lampshades (for tabletops or overhead)...
What the heck* is quasi-crystalline sand?!? You can make glass out of sand, right? Is this just a poncy** term for "fancy glass"?![]()
A quasi-crystalline material can be said to be partway between a glass (amorphous, only very short-range order), and a crystal (transitional symmetry and long range order). Quasicrystals show longer-range order than glass, but they don't repeat that order over then entire substance.