An alternate universe, or alternate dimension, was an alternate version of reality in which a past event had led to different – often drastically different – consequences. In the BIONICLE universe, new alternate universes were continually being formed, as every decision or event resulted in the creation of an alternate universe where the opposite outcome took place. There was no designated main universe; countless alternate realities existed, and the concept of a main reality was simply a matter of perspective.
An alternate dimension was formed whenever a decision was made in the main universe.
Any decision resulted in the creation of a universe where the opposite decision was made.