Why indeed, people hire prop fillers? There are several reasons, but they are so specific that, in the general case, an imitation rock made out of styrofoam is as good as the real deal. Thus, we have a local economic crisis in Webcomic World.
Meanwhile, Zip is still being pursued. He's so terrified the restyling was undone. Egads!
— Bruno "Professional Mole" GuedesFriday, March 11th 2011
Yes, this comic was done solely because of that 5th panel. I just couldn't waste this brick joke. :P