24-cell
Videos
In four-dimensional geometry, the 24-cell is a convex regular 4-polytope, a four-dimensional analogue of a Platonic solid. It is named for the 24 octahedra that form its boundary.
Octacube steel sculpture at Pennsylvania State University
Platonic solid
Videos
In geometry, a Platonic solid is a convex, regular polyhedron in three-dimensional Euclidean space. Being a regular polyhedron means that the faces are congruent regular polygons, and the same number
24-cell
…In four-dimensional geometry, the 24-cell is a convex regular 4-polytope, a four-dimensional analogue of a Platonic solid. It is named for the 24 octahedra that form its boundary. It is also called C24, or the icositetrachoron, octaplex (short for "octahedral complex…
Kepler's Platonic solid model of the Solar System from Mysterium Cosmographicum (1596)
A set of polyhedral dice
Tetrahedron in Bottrop
Solar cube at Discovery Cube Orange County