For the same of the philosophically minded, I should add that shifts in atomic or electrical structure do not change the identity of the existent in question. I'm staring at now, does not mean that the cup will become a bird and fly away. Any changes that occur are set within the potentials of that cup. Which is to say that the reality represented by it does not change. It might be quite simply a matter of semantics though - you call it levels of reality, I call them different realities.
Some people say they can see auras.
When in a hypnagogic state, people can be hypersensitive to sound, color and taste. I remember I felt as if I could hear peoples thoughts - but was probably just so sensitive to sound that it felt that way. We don't know why some people spontaneously combust. Reality is something that isn't there except for when you experience it. It changes when your view of it changes.