Geometry

https://commons.wikimedia.org/wiki/File:London-bridge-1682.jpg

“The happiness of London is not to be conceived but by those who have been in it. I will venture to say, there is more learning and science within the circumference of ten miles from where we now sit, than in all the rest of the kingdom.” — Samuel Johnson

“I believe the parallelogram between Oxford Street, Piccadilly, Regent Street and Hyde Park encloses more intelligence and human ability, to say nothing of wealth and beauty, than the world has ever collected in such a space before.” — Sydney Smith