description page was here. All following user names refer to en.wikipedia. 2007-03-31 20:47 Tomruen 630×657 (25225 bytes) Image of [[Hemi-icosahedron]] English
org/licenses/by-sa/4.0CC BY-SA 4.0 Creative Commons Attribution-Share Alike 4.0 truetrue English Dimensions of Jessen's icosahedron embedded in 4-space on the 3-sphere
√3 rectangles found in 200 central planes of the 120-cell and its hemi-icosahedron cells of radius √2. The planes also contain √6 equilateral great triangles