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Any idea how the graphics gets rendered on the brower here? Is there a javascript library for this?

I see further interesting graphics from the author here: https://github.com/zalo/MathUtilities

The first post is done in Paper.js, while the rest of them are done in Three.js. The scripts in MathUtilities are for the Unity3D game engine.

All of them are excellent graphics frameworks (though with strengths in 2D, 3D, and standalone content respectively).

The canvas has a mousemove handler that points to http://paperjs.org/