So, why is there a “Doh!” in the subject line? Well, the GalleyCat logo is a line of books— not terribly original, you'd say— just a row of assorted-sized books, sitting on a shelf. But, you don't see the spines of the books. Instead, you see edges of the pages, the normally unseen (here comes the “doh!”) other side of book publishing, in effect.
Now I get it.
Addendum: Just happened to see these really cool photos of unusual bookshelves so I thought I would pass them on.