The Imaginary Tree is more of a scientifically accepted concept of the nature of the universe. Or like. How multiple universes and alternate timelines can exist. Each branch is a universe, forever growing, with each leaf a milestone in that universe's time. The tree continues to grow infinitely, absorbing the Imaginary energy in primordial space—

That's one of the elements in our world, along with Fire, Ice, Lightning, Wind, Quantum and Physical.