Pythagoras, Pythagorean, Euclidean, Gravitational Lensing, Symmetry.
Space (this is the official and fancy name mathematicians and physicists call our normal 3D space) with the Euclidean Norm (this is the fancy name for the Pythagorean Theorem) is expected to have the rotational symmetries I mentioned earlier(I encourage you to try to imagine a proof for this and to