Paper by Erik D. Demaine

Klara Mundilova, Erik D. Demaine, Robert Lang, and Tomohiro Tachi, “Curved-Crease Origami Spirals Constructed from Reflected Cones”, in Proceedings of 26th Annual Conference of BRIDGES: Mathematics, Art, Music, Architecture, Culture (BRIDGES 2023), July 27–31, 2023.

We describe two exact geometric constructions of origami spirals obtained by creasing a flat sheet of paper along 2 n curves, alternating mountain and valley, where the 2D crease pattern and resulting 3D folding are 2 n-fold rotationally symmetric about the center. Both constructions use conical developable surfaces and planar creases. In one construction (conical spirals), the cone patches all share an apex (the center), effectively forming one big (creased) cone. In the second construction, inspired by David Huffman's “exploded vertex” designs, the cone apices are the vertices of a central regular polygon. Both constructions have planar creases and, in addition to their rotational symmetry, are reflectionally symmetric through the base plane.

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Last updated May 1, 2023 by Erik Demaine.