Mr Doob Spin Painting __top__ -

His portfolio at mrdoob.com is a graveyard of viral web experiments, including:

The physics here are surprisingly satisfying. As you move your cursor across the canvas, you "draw" lines of neon color. But because the canvas is spinning at a variable speed (use your scroll wheel or up/down arrows to change the RPM), your straight lines instantly curve into perfect, mathematical spirals. mr doob spin painting

If you're eager to try your hand at spin painting, here are some tips from Mr. Doob: His portfolio at mrdoob