🧪 3D Hourglass

Watch sand flow through a narrow neck in this 3D Sand Timer. Click to flip it!

Special Relativity3DModerate60 FPS📱 Mobile-adapted

⚙ Under the hood

This simulation visually represents the concept of time dilation as predicted by Einstein's theory of relativity. It demonstrates how relative motion affects the passage of time, showcasing a simplified model of spacetime.

Time DilationSpacetimeRelativity

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