Street Artist Posterchild has brought portals and the Weighted Companion Cube into our reality, and it's a good thing this all happened in Toronto because I think if I'd seen it unexpectedly while walking around New York, my thin grasp on what is real and what isn't might be irreversibly shattered. Posterchild is apparently an even bigger nerd than Banksy, as he was also responsible for those awesome Mario Question Blocks you may remember from a few years ago. Dude loves cubes, what can you say?
Lots more pictures and info over at The Torontoist.
Also, fans may want to visit Portal Authority, Geekanerd's insanely popular round-up of the internet's best Portal content.