Dry

paint over the red. the brush holds only so much ink.

a sumi brush that runs dry: ink over a pale red model on a practice sheet in as few dips of the inkstone as you can; slow strokes lay ink, quick ones fly white

A brush carries a fixed load of ink, and the paper takes it at the rate the hair touches it: a slow stroke lays it thick and spends it fast, a quick one stretches it thin, and as the load runs out the outer hairs stop touching first and the line breaks into white streaks -- flying white, feibai. The red is a copybook model to ink over; the score is the dips it took. The brush is this card's model of one, not a measurement.

Concepts: motion, perception.

An interactive you play with one thumb, on Wundr.