Physics
3D water surface: drops, interference, obstacles.
A 3D water surface obeying the wave equation: click to throw a splash, turn on the rain, watch ripples interfere and caustics dance on the bottom. Drop the floating sphere in and see it bob on the passing waves. Wave speed and damping shape how far every ring travels.
Equations h_tt + γh_t = c²∇²h Δt ≤ Δx/(c√2)
Physics
The screen never changes; the sorting does. Detectors C and D each show fringes with a contrast near one, and adding them back together gives a contrast near zero - the interference was in the coincidence subset, not on the screen.
Physics
A ball dropped in a liquid stops accelerating: weight, buoyancy and Stokes drag balance. Time it between the marks and the viscosity follows.
Physics
A transparent driven drum with thousands of colliding, spinning grains. Explore avalanches, cascading, centrifuging and three-dimensional mixing.