Two thousand particles ride a divergence-free noise field until their ink runs out. No stroke is ever retraced, and none will occur again.
A plane cut and re-cut at the golden section until the cells refuse to divide. A few are gilded — the algorithm alone decides which.
Sediment laid down in seconds instead of centuries, then cut by erosion. Look closely for fossils — every visit buries different ones.
A branching grammar grown under n-fold symmetry, terminating in petals. Botany, minus the biology.