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Aug20-04, 11:39 AM
Sci Advisor
P: 2,510
To expand on what Halls said, the rubber sheet has a two-dimensional surface, and gets curved in a third direction. Bringing the analogy to reality requires adding one dimension, so the three-dimensionsl surface we call the universe curves in a fourth direction. This is a direction in which we cannot move or look (or point, or even think).