🧪 Sand Terrarium 3D: Falling Voxels, Elements and Reactions in a Glass Box Lab

Pour sand and water, drop in ice, light the wood and release lava inside a glass terrarium made of 196,608 falling voxels. Tilt and shake the box, heat or freeze with the wand, watch ice melt, water boil, sand turn to glass and lava harden, then take the Fill the bucket and Melt the ice tower challenges. Real equations for angle of repose, buoyancy, Fourier conduction and latent heat, with honest model-versus-real notes.

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