John Archibald Wheeler, the living force of quantum mechanics and general relativity, said in his book 'A Journey into Gravity and Spacetime,' page 110, Scientific American Library, W. H. Freeman, New York, 1990, that the 1-dimensional boundary of the 2-dimensional boundary of a 3-dimensional space is zero.
But the 2-dimensional boundary of the cube is where the action is! That is where the content of energy-momentum tensor is revealed, and where the force of gravity is not zero.


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