differences of perceptions between individuals who exist in different places of one room is too big already to cause desynchronization. but if you have two copies of one person with absolute similar experiences (for example, one is "real" and other is simulated). how can one say where does he exist now? he can reason he exist in either of these states or even in both at the same time (or in different times even, eons apart). that's the basis if nietzsche's idea.
Russian Federation