The Imaginary Tree is a theory of the universe widely accepted by the modern scientific community.
This theory describes the various worlds existing in different spacetimes as having a tree-like structure. Each branch is a specific path along which worlds might exist, with every leaf being the marks these worlds have made along the parameter of time. The crown of the tree remains in a dynamic state as it absorbs the masterless Imaginary Energy from the space-time vasculature of the trunk. New shoots grow, withered leaves fall, and endless births and deaths occur among the infinite universe… Describing the universe's structure as a “tree” may be an attitude that views the Imaginary Tree as a lifeform.
Before the theory of Imaginary Tree was put forward, the universe had been addressed as “a void and indiscernible object” because of its undetectable nature. After the theory was developed, people would visualize its principle using imagination: The untamed imaginary energy surges endless through space-time vasculature, and forms at its tips “star clusters” that humans can understand — in other words, countless worlds. The worlds are separated from each other just as leaves are separated by air, between which are unknown imaginary domains that are nigh impossible to traverse.
The Intelligentsia Guild had once thought that Harald Punch, the 2nd member of the Genius Society, was the first to propose the Imaginary Tree origin theory. After multiple assessments on the influence of the History Fictionologists, the scientific community now commonly accepts Zandar One Kuwabara as the person have proposed it.