Hacker News
- How to use Mathematica and the reverse of a map projection to make a paper sphere displaying a panoramic photo http://danielwalsh.tumblr.com/post/96202309677/how-to-make-a-paper-spherical-panorama 9 comments math
- An exploration of the rolling shutter effect in iPhone photos, with math and animated gifs http://danielwalsh.tumblr.com/post/54400376441/playing-detective-with-rolling-shutter-photos 7 comments math
- An explanation of how a toroflux works (a topologically-interesting Slinky-like toy) with diagrams and animated gifs http://danielwalsh.tumblr.com/post/20687530490/playing-with-a-flowing-torus 18 comments math
- Building a rhombicosidodecahedron out of plastic juice bottle connectors http://danielwalsh.tumblr.com/post/17184896029/a-recycled-rhombicosidodecahedron 3 comments math
- Why slinkies fall in a surprisingly strange way http://danielwalsh.tumblr.com/post/11566016253/explaining-an-astonishing-slinky 6 comments math
- My friend's blog about geometrical art http://danielwalsh.tumblr.com/ 17 comments math