「虚数之树」是现今学术界普遍接受的一种宇宙理论。
该学说将不同时空的不同世界比作树状结构：每一株枝干，都是一种世界存在的形式；每一片花叶，都是它们在时间维度中留下的现在与曾经。树冠因汲取时空维管中无主的虚数能量，而始终存在动态的结构——新芽生长，枯叶脱离，无垠宇宙中上演着无数的诞生与终结…将宇宙结构比喻为「树」，或许是一种将「虚数之树」视为生命的态度。
宇宙在「虚数之树」学说被提出之前，曾因其无法被观测的性质，被称为「虚空恒盲之物」；而学说诞生之后，人们便能借助想象勾勒其作用原理：无主的虚数能量，经过时空维管不停地奔流，在末梢形成了我们所认知的「星系」——即不可胜数的世界。而在世界与世界之间，就像树叶与树叶之间存在空间上的阻隔一般，是难以跨越的未知虚数空域。
博识学会一度认为天才俱乐部#2哈那德·庞奇率先提出了「虚数之树」的起源学说；反复审度虚构史学家的影响后，现在学界普遍认为#1赞达尔·壹·桑原才是首位提出者。
Imaginary Tree (Theory)
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. Every 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 life form.
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 endlessly 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 to have proposed it.
