Arches are a wonderfully stable architectural form. Take a book out of the structure for reading, and the rest will remain standing. Just remember to put it back, and make sure the "keystone" book is something so dull that you won't want to read it... the telephone book, perhaps?
The watercolor The Golden Snitch is 15x30cm format, performed on Arches paper, 100% cotton, fine grain and a thickness of 300 grams. The subject is the snitch, which is in the Quidditch game in the Harry Potter series written by cult JK Rowling Delivered unframed, signed on the back.