Math/pattern/Mathematica blog

This entire Tumblr blog is just fantastic.  It makes me want to do this stuff, too.

Some more that he links to (note I'm not even troubling myself to pretty the links up):

• http://blog.matthen.com/
• http://iomikron.tumblr.com/
• http://sayitwithscience.tumblr.com/
• http://spookyactioncollective.tumblr.com/
• http://notationnotes.tumblr.com/
• http://tumblr.wblut.com/
• http://wowgreat.tumblr.com/
• http://homespungeometry.tumblr.com/