Rabbit holes
Da Vinci
Divine proportion
Dodecahedron
Dymaxion
Euclid
Golden mean
Hexagon
Icosahedron
Icosidodecahedron
Making a lamp
Motivation
Octagon
Pentagon
Pacioli
Paper
Plato
Rhombicosido-
decahedron
Rhombicub-
octahedron
Symmetry
Truncation
Wood
Zometool
Rhombicuboctahedron 3
Pacioli hangs it up

Painting of the Renaissance geometer, Fra Luca Pacioli, by Jacopo de Barbari, 1495, Capodimonte Museum, Naples. In the upper left, there is a glass rhombicuboctahedron hanging from the ceiling, half filled with water. (Note also the model of a dodecahedron in the lower right.)

