Deep Sea Jellyfish: 3D Movement Simulation (2D)

This 2D companion keeps the same underlying mechanic as the 3D version — a bell that contracts on a sine pulse and, because contracting the bell pushes water downward, thrusts the animal upward — but reads it on a flat canvas instead of an orbiting WebGL scene: five bells pulse at an adjustable rate, each contraction stroke visibly nudges its jellyfish up, trailing tentacles sway behind them, and a field of bioluminescent plankton drifts and flickers in the dark water so the jet-propulsion cycle is easy to watch stroke by stroke.