Construct this attractive set of shelves with a minimal amount of tools and time, and material you can find anywhere. The name for these shelves comes from the simple joint that holds them together, also called a half-lap joint. Each half of the joint is a notch that fits over the other piece. When put together, the two notches interlock, making a very strong and stable structure. The good news for the beginner is that these don't have to fit perfectly to work effectively.