Figures
Real machines, drawn as small working models. Hover to scrub the motion, or use the arrow keys to step through it.
Scroll story
Follow a drop of oil from the pumpjack, down to the pump at the bottom of the well, through the refinery and the tanker, and into a car's engine. The pumpjack runs on its real linkage, and the valves at the bottom of the well open and shut with every stroke.
Start the journeyThe movement behind a film projector: a crank pin steps a cross a quarter turn, then lets the frame rest.
The flaps of a station departures board. Each top half swings down over the bottom, and the change ripples along the row.