Change Blindness for 3D space

This I guess doesn't really surprise me. Researchers from Oxford found that they could make "..the room grow in size as people walked through it, but subjects failed to notice when the scene around them quadrupled in size. As a consequence, they made gross errors when asked to estimate the size of objects in that room."

Other change blindness demos/articles/etc. can be found on Dan Simons website. I encourage everyone to look at some of these demos - they're great.