Menger Sponge (Image ©MovieVertigo)
This is one of my renderings of the inside of a Menger Sponge. The Menger Sponge is a fractal object with the unusual properties of both infinite surface area and zero volume.
To construct one, take a cube and divide it into 3x3x3 smaller cubes (Like a Rubik's cube), then remove the centre cube from each face, plus the cube in the very centre. Then repeat the process recursively for the remaining cubes.