Parallel Universes?

If we consider the existence of parallel universes, it is possible that the state of an atom in one universe may be different from that in another, but this does not necessitate the existence of a parallel universe which is outside our realm of experience. Each individual has his or her own perceptual universe and therefore may be seeing the same atom in a different state in the same universe. Depending on perspective, the individual, may collapse the wavefunction for a subatomic particle in a different way. As we see macroscopically we see microscopically. Each individual views an event from a different perspective and therefore may disagree on the facts of that certain event. Similarly each individual collapses a wavefunction into a different observable state such that there is no observable state which is objective. Our universe is the totality of these observable states/ these individual perspectives of the universe, such that there is no objective reality beyond that which we agree upon based on our communication. Obviously the implications are great and determine my course of conduct through our agreed upon reality.