In an earlier draft of this comic, it appeared the Farnsworth house was being gnawed by ordinary beavers. My architect brother informed me that Mies van der Rohe was known for his innovations in steel and glass, not wood. So just to clarify: those are MUTANT beavers.
By popular demand, you can order a poster of this comic here. If you'd like, I'll include a footnote about the beavers.
Check out some past Incidental Comics about architecture:
The New Building. The World-Famous Architect.