A quiz question for local readers: Where on the University of Oregon campus did I take this photo?
Like most people, I tend not to notice things above me. S. (age 4) pointed out these beautiful abstract bicycles as we were wandering through campus. Who knows what other ceiling-situated art there is?
The Eighteenth Elephant 
I like the spokes off the square hub in the top wheel. It looks like a computer-created non-intuitive design that has surprising strength.
For other non-intuitive wheel design, check out the cover to this book (which is great, by the way): http://www.amazon.com/Benjamin-Bear-Bright-Ideas-Toon/dp/1935179225/