As in the blog post: http://enja.org/2012/05/07/floating-down-a-tributary/
See video for yourself:
Project is new but worth a try :)
To start playing with it just visit one of examples eg. http://enjalot.com/tributary/2271952/squarecircle.js click on value in source code and see how canvas is changing :)
Github repo: https://github.com/enjalot/tributary
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