Twindrift · Tiny Changes

Set two starting angles, then release from rest. Only the position at the marked time counts: bring the lower weight within 0.16 m of the flower. You can pause, rewind, undo a pose, or use a guide to nudge toward a known catch. Any starting pose that catches is accepted.

The amber twin starts just 0.1° apart. Its separation is a measurement of these two trajectories, not a general chaos score. These are ideal point masses on rigid, massless rods, with no damping. The porcelain drawings are decorative. Pendulum Lab’s equations and RK4 stepping run locally at 1/240 s. Small numerical drift is shown above; long-term prediction of a chaotic trajectory remains sensitive to the initial state and numerical choices.

Keyboard: focus the garden, press Space to release/pause, Left/Right for the upper angle, Up/Down for the lower angle. Progress stays on this device.