A flat sheet procedurally folds itself, stage by stage, into a stylized paper crane, then reverses and loops. Each of the 7 fold stages rotates a subset of the mesh's original flat vertices around a hinge axis by an eased angle; because every frame is rebuilt from the pristine flat coordinates (not accumulated), the fold is perfectly reversible for the unfold half of the loop — the same technique used in real rigid-origami simulators.