Original drawing of Menger Sponge made in SketchUp. Exported raster graphic to Adobe Photoshop CS6 and printed to bond paper.
<a href="//commons.wikimedia.org/wiki/User:Eric_Inglert" title="User:Eric Inglert">Eric Inglert</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>