Octahedron with Concave Faces (CFW 226)

Instructions for this model can be found in Shuzo Fujimoto’s books. It is folded from a 2:1 rectangle, but instructions start from an A4 sheet and include constructing and cutting a sheet of the right proportions.

• Solid Origami, page 19
• Twist Origami I, page 62
• Twist Origami II, page 41
• Invitation to Creative Playing with Origami, pages 47 (instructions) and 50 (image of finished model)