Some unknown genius (possibly redditor Tmyakal) created this insanely great Portal-themed Christmas Tree that presents the illusion of a tree being shoved through one of the interdimensional portals in the kick ass Valve game.
Update: Ryan Kelly sez, "I'm a big fan and can't tell you what a great Christmas present it was to see our Portal themed Christmas tree posted on Boing Boing. It was done by myself and my two business partners as a nice, stress-relieving break from working on a film we are making and was posted by a friend of ours on Reddit."