There are three well-known universes: the objective universe, the perceptual universe, and the conceptual universe.
There are three different universes: the physical universe, the subjective universe, and the conceptual universe. In addition to viewing each universe as an independent and complete whole, these universes (or references to parts of them) may be viewed as parts of one another (in this latter context, they should be called domains ). For example, the conceptual and perceptual domains are parts of the subjective domain, which is in turn a part of the physical universe.
Each of these three different universes can serve as a point of view; a reference point from which to view things, and which is composed of references to other universes.
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