Pythagoras, Pythagorean, Euclidean, Gravitational Lensing, Symmetry.
Broken Symmetry. Humans tend to desire explanations to anything, similar to their daily lives; explanations that involve cause and effect. Sadly or happily, mathematics and geometry, do not work in this way. A feature of the common space around us, like the Pythagorean Theorem, is not caused by