Here's further proof that basically everything goes better with Portal. Check out Ryan Kelly and his coworkers' Portal-fied Christmas tree, which certainly beats the hell out of the 20 years' worth of musty tinsel I festooned all over my folks' Tannenbaum this very evening. Also, learn how to make this Aperture Science-infused arbor for next year.
Kelly broke down the construction process for io9 as such:
Basically, it's our artificial tree which comes apart in three sections. The top section is suspended from the ceiling by an adhesive hook so it simply hangs downwards. The other two sections are connected and placed upside down on the floor - the tricky part is that the branches are meant to be kept extended out by gravity, so there is fishing line attached between each branch and what is usually the base of the tree, pulling the branches up towards the ceiling.
We then got two sets of rope lights (blue and red as we couldn't find orange). We laid the red out in a tight circle around the tree on the floor. The blue was wrapped in a circle, scotch taped to hold together, and then hung on to more adhesive hooks on the ceiling. Then we cut two circles of black poster board and placed these beneath the rope light rings to give them the feeling of holes. You barely see the black with all the branches and the portals lit up so it plays fairly well.
Finally, the hanging top piece didn't have branches that extended all the way up to the ceiling, so to cover the obvious gap we bought some artificial garland and wrapped that around it to match up with the ceiling. That way it looks like the tree continues up into the surface.
With a little bit of finessing, you can hide any of the obvious gaps and have one seamless tree.
Rad! You can see some more photos of the tree below, including a photo of Kelly's friend Jason entering the portal. For more Portal-inspired sculpture, see New York City's giant Companion Cube.