🌀 Rotating Liquid Paraboloid 3D Physics Simulation: Newton's Bucket, Spin-Up and Liquid Mirror Focal Length (2D)

A 3D physics simulation of a spinning container of liquid: watch the surface curve into a paraboloid, see Newton's bucket spin-up, dry bottoms and spilling, send a ball inward or outward by density, and measure the focal length of a liquid mirror.