As a librarian, this makes absolute and perfect sense to me

"The tall shelves in Abobe Bookshop display such standard headers as Fiction, History and Gardening. But these labels mean nothing -- at least for the next few weeks.

The only organizing principle currently at work in the Mission District store is visible as soon as one walks past the metal grate and into the cozy, creaky confines: The more than 20,000 used books that line the shop's walls have been grouped according to their place in the color spectrum. Red books are by the entrance, followed, in order, by orange, yellow, green, blue, indigo and violet ones. The remaining space is left for white and black books."

Of course! Patrons are *always* looking for books based on color and size (although, sadly, often the book is a different color than the one they remembered). Read more about this ground-breaking display...