Menger Sponge
A Menger Sponge is a square which is similar to itself. To make a Menger sponge, take a square, and cut a square hole in the middle. Repeat the process around the edge of the square 9 times. Do the same thing aforementioned infinitely.
Menger Sponge Media
An illustration of M4, the sponge after four iterations of the construction process
An illustration of the iterative construction of a Menger sponge up to M3, the third iteration
Hexagonal cross-section of a level-4 Menger sponge. (Part of a series of cuts perpendicular to the space diagonal.)
Sierpinski–Menger snowflake
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