Call me uncool, but this is just weird.. In their own words
"With his systematization of a one-point perspectival system for illusionistic representation, Leon Battista Alberti offered painters a method of constructing a space that was coherent and cohesive when viewed from a single position: painting thus came to simulate a window onto a world beyond, a fictional yet mimetically convincing milieu."
Hope that clears it up, interested? Download it here