The Atrium, Tetracis, or Philosopher’s Stone Mosaic

A unit of this mosaic is an equilateral triangle, divided into four equal triangular parts, each marked with one of four colors.

The complete mosaic set can be assembed into an equilateral triangle, repeating the structure of a single unit and demonstrating the fractal principle embedded into the structure of the Atrium Alphabet.

There are many other ways to assemble this mosaic.