An origami crease pattern (展開図) is the flat blueprint of a folded model — every mountain and valley line drawn before a single fold is made. By software convention mountain folds are red, valley folds are blue, and the paper boundary is black, all on a near-white sheet shifted here to a faint cool drafting grey.

This is the language of computational origami: thin uniform strokes, exact angles, reference markers, and a dense geometric lattice. It reads as engineering drafting, not craft — precise, mathematical, and built entirely from line.