Retain

come back before it fades.

a constellation that dims on the forgetting curve — tap to keep it bright

This is a personal ritual, not a lesson — a small constellation that dims on its own over days, following a spaced-repetition curve, and a tap brightens it again while pushing the next fade further out. Nothing is being taught here; the only thing retained is the habit of returning.

Concepts: memory, forgetting-curve.

An interactive you play with one thumb, on Wundr.