A rendering of the third iteration of the fractal Sierpinski Sponge.
The sponge has a metal-like surface (with specular highlights).
The plane on which it rests has a grassy texture,
achieved by random
permutation of the surface normals (which influences the amount
of reflected light).
One light source is to the right of the eye point,
another one is in the middle of the object.
Rev. 1.0, REM, © 1996 Roman E. Maeder