In the mid-1800s, Schläfli figured out that in four dimensions, there are six regular solids, including one with 600 faces! Each of those 600 faces is itself a three-dimensional tetrahedron ...

In the three-dimensional world, there are five regular solids -- tetrahedron ... squares or pentagons. In four dimensions, there are six regular solids, which can be built based on the symmetries ...

Retrieved March 4, 2025 from www.sciencedaily.com / releases / 2021 / 07 / 210722120607.htm University of Heidelberg. "Silicon with a two-dimensional structure." ...

Its three-dimensional structure then corresponds to a tetrahedron, a body with four sides. Due to the high stability of a tetrahedron, other structures are not known in natural silicon with four ...