The Æsthetics of Portal 2
A set of in-depth articles about the æsthetics of Portal 2 in the form of explaining where, why, and how these themes should be implemented in maps. These few pages are based on Rubrica's tutorial posted on Thinking With Portals.
Note:These pages will not explain various detailing techniques.
Gallery
See also
http://wall_tutorial - Almost every wall in a Portal 2 map was made with this method