Some metaball soup. Using some old tricks.
The base is a bunch of balls in a container using Box2dWeb. Then the balls are rendered like
radial gradients, full alpha center to zero alpha at outer radius.
The result is then thresholded to only keep pixels above a certain value to get a fake metaball effect.
Tried to get this running on the Nexus 10, so did some downscaling-thing for hidpi devices, unsure if
that worked out ok...
Note. You need a modern browser that supports WebGL for this to run the way it is intended.
For example. Google Chrome 9+ or Firefox 4+.
(If you are already using one of those browsers and it's still not running, it's possible that you
have old blacklisted GPU drivers. Try updating the drivers for your graphic card.
Or try to set a '--ignore-gpu-blacklist' switch for the browser.)