Sometimes you're just minding your own business writing code, reading specs, maying layouts, watching the yayQuery podcast... and sometimes you're sleeping. Sometimes you're dreaming. Apparently, sometimes, on very rare occasions you're dreaming you're a Unicorn!
The visualization is actually quite cool (well, minus all the unicorn stuff). It's the jQuery project programmer source code commits over time.
It's like some developer smoked some crack and decided he was a magical wizard casting spells through his computer and these spells produced things called "programs" or "web pages". This programmer wanted to share his trip with the world and created something called "Gource". This will look at a project's source control history and create a visualization based on that. It's pretty amazing actually.