For our money, the Portal games have been two of the most aesthetically pleasing experiences we've ever had. Consistency is the name of the game, whether you're surviving the original's sterile test chambers or traversing the ruined halls of Old Aperture in Portal 2.
Dark Horse's just-announced The Art of Portal 2 will explore the shift to the second game's nature-encroached environments, with 184 pages of concept and final art, character sketches, and commentary from writers, artists and other devs.
It comes out Halloween, though there's no word yet on a price. Check out the images (via Kotaku) for a sneak peek. Doesn't this just make you want to go play Portal 2 again? Let us know in the comments or on Twitter.