This is so cool. Have a look at the world's greatest religious architecture distilled down to its purest geometry in a recent book by David Stephenson called Heavenly Vaults: From Romanesque to Gothic in European Architecture, published by Princeton Architectural press.
The gorgeously-photographed book features images of the underbellies of famous rooflines from churches all over the world. They look like computer illustrations based on the most advanced mathematical calculations, but were all designed hundreds of years ago to honor not science, but faith. Stephenson recalls the history and important facts of each case, then spins the emotional significance of these astounding structures into words.
Available on Amazon.