Pouring colored sand in careful layers is oddly calming until your hand slips or you bump the table and a clean band smears into the one below, and there's no undo, only starting that section over.

Sealing it in glass is the nervous part, since one jolt before it's set can blur all your patience.

The payoff is a pocket of order you built grain by grain, the colors holding their crisp lines behind glass for years.