Origami Crease Pattern

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.

折纸的「展開図」是成品模型在折叠之前的平面蓝图——每一条山折线、谷折线，都在第一次 对折之前就已画定。按照软件惯例，山折用红、谷折用蓝、纸张边界用黑，铺在一张几近纯白、 此处刻意偏向冷调制图灰的方纸上。

这是计算折纸的语言：均匀的细线、精确的角度、参考标记，以及一张致密的几何折痕网格。 它读起来像工程制图，而非手工艺——冷静、数学、完全由线条构成。