Double pendulum & sensitivity
Two coupled arms and the onset of chaos — nearby starts diverge fast.
Damped oscillator in phase space
A mass on a spring, drawn as a trajectory through its vector field. Retune mass, stiffness, and damping and watch the spiral change.
N-body gravity sandbox
Drop masses, set velocities, and let gravity choreograph the orbits.
Wave equation on a membrane
Pluck a 2-D surface and watch standing modes emerge.
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