The real sheets, drawn by a pen on paper. Overstruck plotted on an AxiDraw — black density, two colours in a woven field, and the two-pen checker the engine later learned to make. Photographs of the physical plots; click any sheet to look closely.
The piece drawn in a single black pen. On paper the glyph ramp reads as texture rather than tone — dashes as ruling, hashes as a woven grey, the solid cores as weight. The cleanest, most single-minded reads of the whole batch.
Black writing, fine red ruling. The thin red lays a lighter line than the bold black, so the two pens differ in weight as well as hue: red recedes to a faint underlayer, black advances. In the weaves the two directions split across the pens and the hash regions become cloth.
Plotted as two discrete passes over the same ground, the solid cores stop blending and alternate into a hard red/black checker. No screen decision proposed it — the pen found it, in the gap between two passes. This is the physical origin of the composition the engine later learned as Second Pass.