Dry

the line breaks when the brush runs out. that is the brush telling the truth.

a sumi brush with a finite load: fast strokes run dry into flying white; dip it in the stone

A loaded brush lays down a solid line; as the ink runs out the bristles stop touching the paper one at a time and the stroke breaks into fibres, an effect Chinese and Japanese painters call flying white. How soon that happens depends on two things the painter controls: how much ink the brush carried, and how fast the hand moved. Here the brush has a real load that drains with distance and speed, so every line you draw is a record of both, and the stone in the corner is how you start again.

Concepts: motion, perception.

An interactive you play with one thumb, on Wundr.