Jim Rosenau’s For the Kitchen Bookshelf.

From the website’s FAQ:

1.Yes, they are really books. I remove some of the paper and replace it with a sturdy armature of salvaged lumber.

2. The idea evolved from (mis)reading Nicholson Baker. His essays, Lumber, and, Books as Furniture, triggered me to figure out what I might build if I could turn books into lumber.

For other very funny bookshelves art, see: Link