Shapes that fit together without gaps or overlaps are read as belonging — every piece having its place. Dream books also see in tessellation the comfort of repetition and order.
Has this come up in your dreams before? What was going on in your life then?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.