The title sums it up pretty well, this is a 256x128 observation room that fits snugly into a corner, so long as you have a 128x128 hole in each wall to fit it in!
Inspired by the corner observation room in Test Chamber 15 in the first Portal.

Be sure to let me know what you think, and how I might be able to improve it! Constructive criticism is always appreciated. And finally, I hope you get plenty of use out of it should you decide to download it!

V1.1: Added a cubemap that I'd forgotten to add before initial release.

Better Pictures
I can't get proper images to work for life of me, so you might have to click the links. Sorry 'bout that.
http://i58.tinypic.com/1037b78.jpg
http://i62.tinypic.com/kak1sn.jpg
http://i57.tinypic.com/2n06ngo.jpg

File Name: observation_room_256x128_corner.zip
File Size: 3.02 KiB
Click here to download 256x128 Corner Observation Room

Maybe you can make an outside corner?

I will be stealing this

Another Bad Pun wrote:
I will be stealing this

I'm going to assume that's a good thing.

yishbarr wrote:
Maybe you can make an outside corner?

Sorry, I tried my best to make an outside corner room for you, but the way the obs. room windows work make it so it's a bit of an awkward task. I don't think there would be an effective way to do it short of pointing the window frames inward.