Similarly, I used to wonder why an image constructed with 3-point perspective [1] looks perfectly normal, while one with 4-point perspective [2] does not. [1]

Similarly, I used to wonder why an image constructed with 3-point perspective [1] looks perfectly normal, while one with 4-point perspective [2] does not. [1] http://www.craftsy.com/blog/wp-content/uploads/2013/07/cropped.jpg http://www.craftsy.com/blog/wp-content/uploads/2013/07/cropp... [2] http://www.termespheres.com/images/perspective/fourpointperspec_drawing.gif http://www.termespheres.com/images/perspective/fourpointpers...