Is there a fourth dimension?

Answer:
The fourth dimension is time. To meet with someone you must give the intersecting streets, which represent the x and y co-ordinates. The floor number gives the elevation, plus or minus, and the time (10:30 e.g.). Miss any one of them and the rendezvous won't happen.
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First answer by Sikuan. Last edit by Sikuan. Contributor trust: 109 [recommend contributor recommended]. Question popularity: 1 [recommend question].
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