Bre Pettis spent all of 2025 writing programs — not programs that generate images on their own, but programs that let him drive a machine to make them. In JavaScript he built edge-finders, K-means routines that crush a photo down to two or three dominant colors, and Fibonacci-phyllotaxis layouts that scatter greyscale "seeds," then fed those instructions into a painting machine that hasn't been released yet. Through January, working off Genuary's daily prompts, he forced himself to paint one a day with it: Lincoln rendered in parallel-pen pixels, soap-bubble clusters obeying Plateau's laws in gel pen, 3D scans turned into hatched watercolor portraits. The code side of this is solid — solid to the point of being nearly transparent.

And turning a photo into a plottable SVG — pen-drawing, generative hatching — is by now a fully built language, an already-construct. The chisel has cut that form many times over, and the art world long ago digested "pen plotter" into a DD with a name. What makes Pettis interesting isn't the code; it's the one millimeter the code can't reach. The instant an instruction lands in wet paint, a new remainder appears. Paint flows and pools into little valleys. Wet paper buckles, and where it buckles it rises toward the brush, so the stroke spreads and thickens. As a drop dries, pigment crawls to its edge and every dot resolves into a ring. None of this is in the program. The program is construct; the paint's disobedience is the remainder, and it's alive.

His own notes are a running negotiation with that remainder: because each stroke is only a millimeter long, the brush keeps running dry, so he drops the refill distance from 200mm to 50 to 20; because he loses two magnets, the paper won't lie flat. The more precise the machine tries to be, the more the material talks back. That back-talk isn't a craft failure — just the opposite, it's the first thing in these paintings to come alive. Nobody designed it in advance; it's the leftover term of the chisel-construct cycle that hasn't been collected back yet.

And the timing of seeing it matters because the machine is still unreleased — on the company's site it's only a "super-secret, not-launched-yet" page. Which means "robotic watercolor" has no name yet, no scene, no vocabulary, no consensus to fold it in. Once the machine ships and a community forms, "the paper buckled" will be renamed a "controllable technique," the remainder will harden into construct, and that disobedient millimeter will become a parameter. Precisely because it hasn't been digested, its logic is still growing, still unnamed — which is the reason to look now rather than later.

Han Qin (秦汉) · @hqinjarsy · SAE Judgment & Aesthetics