Tegmark's Hierarchy

Tegmark's Hierarchy is a classification of levels of multiverse theories, illustrating increasing levels of reality's scope. Level I suggests an infinite universe with everything that can happen, happening somewhere. Level II involves multiple universes with different physical laws due to different constants. Level III is the quantum multiverse, where all possible quantum outcomes occur. Level IV proposes entirely different mathematical structures exist as separate realities. Each level introduces a broader and more inclusive view of reality, from our observable universe to entirely separate and diverse realms, emphasizing the idea that reality might be much more expansive than our direct experience indicates.