The layout follows a Kusama Yayoi exhibition poster: a heavy headline, a small line of type level with its top, a field of black circles below, and a red bar of upright type that starts in the headline and cuts into the field. Every line of type on the sheet comes from the controls. The headline takes one word per line and shrinks only if a word would run into the small text or the bar.
Circles keep arriving in the roomiest gaps they can find and grow until they meet something: another circle, the edge of the field or the bar. Each one is given a share of the space when it arrives. Most get a small share and a few get a large one, which gives the field big circles with small ones filling the gaps between them.
Each circle also has its own resistance. Under pressure, a stubborn one holds its size and pushes back, and a soft one gives way and shrinks. Turn max resistance up and the packing gets tighter and more crowded. Turn it down and the circles settle into an even field.
Whatever is in shape text, a triangle to start with, is packed into the field in the same red as the bar. The shape is never drawn. It is a mask, and a circle that ends up mostly inside it takes the accent colour, so the figure appears from the packing. Words work too, one line each. Circles inside the shape are set small so the edges read cleanly, and they grow again over the falloff distance. The circles never measure that distance themselves: one distance field is worked out per run, and each circle looks up its size from that.
Change the type or the size controls and the run starts again. Change the count and it carries on from where it is.