Books falling over? Here’s a simple bookend project. Total cost under a buck, and you can make them in just a few minutes.

The symbols on these particular bookends are in bra-ket notation, which is very common in many fields of physics related to quantum mechanics. Obviously, you can use other symbols as well— we put /* and */ around our programming books.

We said that it’s simple, and it is: it’s a brick wrapped in a piece of paper. If you don’t have a couple of bricks…