All living things have their own unique patterns. One of people's unique patterns is their fingerprint, and each tree has a different ring shape. Changes in the shape of tree rings occur depending on the environment and external factors. The growth rings of trees grown in harsh environments are cracked and angular, while the rings of trees grown in good environments are round and soft. In this way, all living things, including humans, are influenced by external social and environmental factors and have their own unique patterns.