Apologies for my negligence in the past weeks on the illusion front. I promise I have something awesome to make up for it. Donna stumbled across a 17th century manuscript investigating mathmatical properties of perspective. La Pespective Curieuse by Jean François Niceron is a massive volume containing formulae and musings on drawing in perspective, reflections, distortions and projection.
Below are some of the plates contained within the work. Mathematically stunning work.