Jay Petersen who was recently featured on knithacker has created a first iteration Menger spoge and its inverse, the Menger anti-sponge, using entrelac knitting. In the video you can see him snugging both shapes together, something that can only be done with fluffy fractals.

(via fuzzyjay)

The first iteration Menger sponge requires 72 patches and the anti-sponge another 30. If you wanted to knit a second level menger sponge you would need as much as 1056 patches for the sponge and another 774 for the anti-sponge.