🏰 Castle Mason's Yard: Lime Mortar, Walls & Treadwheel Crane

Build a 12 m stone wall or a round or square tower, mix lime mortar and watch it harden with the square root of time, then strike the scaffold and raise the wind. A heat map and the thrust line show why a wall stands while the push stays in its middle third. Add walkers to a treadwheel crane to lift a stone block and see the lever and pulley arithmetic.

3D · Three.js / WebGL renderer · 60 FPS target · runs fully client-side, no install