Special “observers” have no real role to play in the theory. The central point is simpler: the properties of an object become manifest when this object interacts with others. We cannot separate the properties from these other objects. We cannot attribute them just to a single object. All of the (variable) properties of an object, in the final analysis, are such and exist only with respect to other objects. “Contextuality” is the technical name that denotes this central aspect of quantum physics: things exist in a context.
