A tiny chaos machine

Two rods, one hinge. The maths is exact and only a few lines long — yet nobody can tell you where it will be in a minute. Drag the tip somewhere and let go.

θ₁ — θ₂ — energy —

Upper rod 1.00 m Lower rod 1.00 m Lower weight 4 kg Gravity 10.0

Three pendulums are running, not one. They start a thousandth of a degree apart — watch how long that stays invisible.