tl;dr: An interactive, deeply illustrated walkthrough of how a mechanical watch movement works, breaking it down into seven core timekeeping components (mainspring, gear train, escapement, balance) plus complications like date display, keyless works, and automatic winding. Each part is explained with draggable 3D animations showing how energy flows from the wound mainspring through the escapement and balance wheel to drive the hands at precise rates, ending with a scale demonstration showing the entire mechanism fits within a credit card's footprint.