Twenty-five marbles share one winding track through eighty mechanisms, and a lift carries them back to the top. A door there lets one through every ten seconds, and three hoppers count the minutes. A marble contact advances a twelve-position hour pointer, and a common gate starts two marbles on a straight and a curved race track. Levers, paddles, bridges and pendulums move by physical contact. Follow tracks a marble picked at random and moves on to another every so often; tap any marble to follow that one. Tap elsewhere or press Space to pause and resume. Scroll or pinch to zoom, drag to move the view, and press Home to see the whole machine.
Assembling the machine
The machine could not start
Paused. Tap or press Space to carry on.