This is the brain of Caenorhabditis elegans, ported to Javascript. C. Elegans is one of the simplest organisms with a nervous system, with a brain containing only 302 neurons. As of 2012, the only organism to have its connectome (neuronal "wiring diagram") completed. via Wikipedia

Be warned that by running this, you may be simulating a living being depending on how you think about it... best not to think about it too much

Based on the python GoPiGo Connectome by Timothy Busbice, Gabriel Garrett, Geoffrey Churchill

You can see the brain placed in a little virtual worm body here