The Menger sponge is constructed by dividing a cube into 27 cubes, then removing the middle cube of each face and the center cube. This process is repeated at each iteration, in the limit creating an object that simultaneously exhibits infinite surface area and zero volume. This Demonstration shows how the surface area of the sponge tends to infinity for each level of the cube while the volume tends to zero.

The slider "separate cubes" helps to visualize the structure; the faces that were originally touching are not counted in the surface area.