These "brick books" are created by Melbourne's Daryl Fitzgerald who markets them to booksellers and others as "Book ends, display piece, use them however you like!"
I write books. My latest is a YA science fiction novel called Homeland (it's the sequel to Little Brother). More books: Rapture of the Nerds (a novel, with Charlie Stross); With a Little Help (short stories); and The Great Big Beautiful Tomorrow (novella and nonfic). I speak all over the place and I tweet and tumble, too.