Shelf within a shelf

Just a paper shelf, really. Made from scraps. Can you tell it wasn't digitally planned with precision? The bottom shelf is 1/4 inch shorter than the rest. My mistake. I had the wood for it, too. Some dark endgrain (visible at the lower corners) is the dead giveaway. And the top shelf is too short. Oh well. It works. This is part of the wall shelves in my office.