What Eudoxus and Aristotle thought about planetary motion. You'd think there would be nice animated illustrations of this stuff on the Web somewhere, but I didn't manage to find any, so I made my own.
Remember the floating training remote in Star Wars? Some people have done DIY versions of the remote that can levitate on your desktop. However, leave it to NASA to create the real thing and call it SPHERES: Synchronized Position Hold, Engage, Reorient, Experimental Satellites: robotic bowling balls (OK, 18-sided polyhedron satellites) with autonomous propulsion, power, avionics, software, communications, and metrology subsystems, that fly freely in the ISS. First tested in 2006, they have been upgraded with Android smartphones, which makes them (for now) the less terrifying item in Google's growing robotic arsenal.
Paper Matrix is a blog that gives instructions for cool papercraft objects, "reinterpreting the Danish tradition of woven paper hearts and ornaments." Cut paper in the prescribed ways and weave it together carefully to make a mobile of colorful hot air balloons, gorgeous and complex boxes; simple but satisfying pennants and much more... including a full theater for performances by paper dolls.
Not little fluffy clouds in Arizona, but little squishy, um...orbs. In the desert near Tuscon, thousands of tiny purple spheres have appeared, isolated from the rest of the terrain. The mysterious objects, described as being like "gooey marbles that ooze out a water substance when squished," have yet to be identified.
The Minor History of Giant Spheres is an illustrated timeline of, well, giant spheres, including the spherical republic of KugelMugel and the great Darwin Twineball. Also online is the Minor History of Miniature Writing, and the related timeline of timelines [prev.].
Sphere and circle arrangements, the Droste effect, and more: mathematical imagery by Jos Leys. The Droste effect article is informative, too.
I always knew that Star Wars was real. But I always thought the Death Star was a little bigger. Sometimes the Internet makes me laugh.