This 2D companion to the 3D origami crane simulation shows the actual flat crease pattern behind the fold: a square sheet gains its diagonal and median creases (the preliminary base), collapses into a four-flap diamond, then two opposite flaps are petal-folded — an exact geometric reflection across each flap's own symmetry axis — into a thin neck and tail while the other two flaps rotate outward into wings. Step through the seven stages with the slider or Next/Prev buttons, or press auto-play to watch the fold sequence run on its own, with mountain and valley fold lines drawn in the standard origami-diagram convention at every step.