One apple will never be equal to one orange in every physical characteristic. However, zero apple will always equal zero orange since equally nothing are always equal. On the other hand, how could equally something be equal in general? How could one spacetime point be equal to another spacetime point? Equality seems to require directional properties such that two or more spacetime points share the same direction or orientation. It is then clear that all physical objects in this universe have the same time direction even though nobody knows just what the real orientation of this direction in 3D space.


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