I put these flying books in the "maybe a mural" category mostly because they aren't, well, flat. And, unfortunately, some of them are deteriorating; artist Simon Donovan mentioned (at a talk he gave downtown for TPAC) that they weren't sealed properly.
If you haven't seen them, why not stop by now? And, while you're there, go inside and grab a book of your own. These are on top of the south wall at Woods Memorial Library, 3455 North 1st. I took the photo on December 23, 2010.