This is one of a set of four collaborative posters I am printing this month.
I made this particular image by writing a collection of Perl scripts which arrange photos from the squared circle group on flickr in a fibonacci spiral (a natural way of tiling circles, seen in sunflowers, pinecones and many other [...]

55 Optical Illusions & Visual Phenomena by Michael Bach

This is my favorite pocket calculator, the Casio CM-100. I’ve had it since the mid-80s, and unlike countless writing utensils, hats and pairs of sunglasses, I’ve managed not to lose it.
I’m particularly attached to it now, because none of the calculators currently for sale at Staples, Office Depot or Amazon.com are nearly as good. [...]