Fig. 4. "Elevated rhombicuboctahedron" from the manuscript version of De divina Proportione. It is a nonconvex construction of ninety-six equilateral triangles arranged with octahedral symmetry. Three-sided and four-sided pyramids have been erected on the faces of the underlying rhombicuboctahedron, which consists of eight triangles and eighteen squares. | top of page |return to text |