Artisan David Macdonald created the following photo montage using pictures taken of the courtyard of his loft in Brussels, Belgium. The entire scene is a little uneasy because it is hard to get a proper sense of direction. The windows do not seem to line up properly. Are you looking up at this scene or down at it?
Many other artists have incorporated this type of effect into their illusion images. You might recall Corner House by Istvan Orosz and Impossible (and Crazy) Tennis by photographer Michael Kai. Be sure to visit Cambiguities to see more works created by David Macdonald.