Day 242 · September 12, 2026
Unmix
A thousand folds.
One way back.
Drag inside the chamber to add your own turns. Unmix follows the entire score backward, including your hand.
Keyboard: ← → add a turn
Space holds · U unmixes
The order of undoing
Turn one way, then the other. The lines stretch into hair, curl around the spindles, and pass through one another’s old places. What looks lost is still an arrangement.
Press Unmix. The last turn is undone first. Every line travels home along the path it took away. The starting picture is kept only as a ruler; the return is calculated from the tangled one.
This is an ideal chamber. Nothing diffuses, nothing is discarded, and every turn is known. Real ink has fewer privileges. The inspiration is the unmixing demonstration: slowly stirred dye can gather back into a line when the stirring is reversed before diffusion has dispersed it.
Inside the chamber
144 material lines, each sampled at 1,280 points. Two compact radial maps turn points by an angle that falls smoothly to zero at their rim. Each map preserves radius about its own center and preserves area. Its inverse changes the sign of its angle. A sequence is undone in reverse order.
The motion is double-precision geometry, not a Navier–Stokes solver. Line weight, exposure, score length and tempo are composed by eye. The house score is limited after testing its curve sampling. Repeated hand turns can still make folds finer than the drawing can resolve. The measured return error is shown when the last turn is undone. Nothing is uploaded or retained between visits.
The numerical gates cover radius, support, inversion, operation order, local area, line stretching and repeatability. Their source is open to inspection. The picture has its own test: does it hold before a word is read?