WebGL enables nice and smooth hardware-accelerated graphics for web applications. It is now supported in latest versions of Google Chrome, Firefox or Safari (you may want to update your browser). Not sure about IE.
If you're in Safari, go to Preferences, then to Advanced and select Show Develop menu in menu bar checkbox at the bottom. Now you can open Develop in menu bar and select Enable WebGL. You're ready to go!
Firefox users (in case if WebGL is somehow disabled by default) could go to about:config (type it in the address bar) and then set webgl.force-enabled parameter to true.
This application is implemented in hardware-accelerated WebGL and is based on a famous cellular automaton known as Conway's Game of Life. Read Wikipedia article about it.
Source code available at GitHub: https://github.com/xpl/expression