Octahedron with Concave Faces (CFW 226)
Model
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Folding instructions: Octahedron with Concave Faces (CFW 226)
This is the primary page for this model.
Paper: Eko Lux
Type: other single-sheet polyhedra
(implies: abstract single-sheet, abstract, balls and polyhedra, geometric, mathematical object, other polyhedra, single-sheet)
Author: Shuzo Fujimoto
Colors: brown and beige
![](/small/img/models/o/octahedron-concave-faces-cfw-226-1-300-06b22a506.jpg)
![](/small/img/models/o/octahedron-concave-faces-cfw-226-2-300-ea467f7b0.jpg)
![](/small/img/models/o/octahedron-concave-faces-cfw-226-3-300-70fb65564.jpg)
This polyhedron is like a regular octahedron whose each face was replaced with a triangular pyramid pointing inwards. The three faces other than the base are equilateral right triangles, so these pyramids fully fill the inside of the octahedron, resulting in a skeleton consisting just of three intersecting squares. Just like a normal octahedron, this shape is difficult to photograph since only a few faces are ever visible at the same time.
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