Sorry, I did not know where to post this as it is sort of a "philosophy of physics" question that I am not sure has an answer and was curious if anyone had any thoughts not grounded in pseudoscience. How can a set of particles interacting in quantum fashion (perhaps a bose einstein condensate, etc) distinguish which universe they are in objectively? ie from the point of view of the objects in quantum superposition until they take a measurement of "the outside world" could it appear to them that different (and contradictory) laws of physics are at play? What I am picturing in my mind is a set of particles that is interacting as a set of overlapping waves so if the overall wave function approximated a sinusoidal wave and the interacting surfaces of various respective sets of objects interacted in a similar fashion could the case be that the "reality" these sets share overlap, but not continuously? ie Think of it as a quantum mechanical analogue to a mirage where the angle for information to be accessed between the realities changes as a function of time similar to how the reflection of the sky in the sand changes as the distance between the observer and the heated surface changes the angle at which light is reflected to the eye via the surface. Does this make sense?