Wolfram Demonstrations Projecthttp://demonstrations.wolfram.com/An Open Resource of Interactive Mathematica VisualizationsCopyright 2009 Wolfram Demonstrations Project & ContributorsVolume and Surface Area of the Menger Spongehttp://demonstrations.wolfram.com/VolumeAndSurfaceAreaOfTheMengerSponge/]]>http://demonstrations.wolfram.com/VolumeAndSurfaceAreaOfTheMengerSponge/