Unrelated: writelatex.com is the only site I've noticed that sees when you don't load some of the JS it requires from third-party domains, and warns you about it! Great little feature.

Thanks for noticing :) That check has greatly reduced the number of confusing support requests we receive.

For those who want to see more, this is build using PGF/TIKZ, a library with one of the most extensive and awesomely looking documentations around:

http://mirror.jmu.edu/pub/CTAN/graphics/pgf/base/doc/generic...

I've used TeX/LaTeX for 24 years and I look at PGF/TikZ and it seems more verbose than I can stand. Do you edit it by hand, which seems to be the case for simpler diagrams, or is there a map/transform application that can take output from drawing applications?

This is really cool! I always wanted to do an impossible shape in PostScript, this makes me want to take the time to actually do it. Thanks for sharing!

No problem :-) I loved this example when I first saw it, and someone shared it with me again today so I decided to post it here.

I imagine this would be a great way to make logos for your startup.

Has anyone tried using something like emscripten to set up a version of TeX that can run in the browser?

Yes: http://manuels.github.com/texlive.js/website/ -- "This is a port of TeX live 2012 to Javascript."

Also related: http://www.mathjax.org/

The port to Javascript is really neat, I remember when that was on HN a month or so ago