FURTHER S.T.R.E.T.C.H.I.N.G. OF THE GRAY CELLS
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Each of the four space-time dimensions of the physical universe is independent of the others. For example, in the length dimension we can extend a line as long or as short as we like without affecting any measures in the width, height, or time dimensions. Similarly, lines can be extended as far as we want, even infinitely far, along each of the dimensions of width, height, and time without affecting measurements in the other three dimensions. This independence means that each dimension always must be exactly perpendicular—exactly at a ninety-degree angle—to all the other dimensions (in Euclidean geometries).
~ Beyond the Cosmos,
Dr. Hugh Ross, Ph.D.