Within a global coordinate patch where the 2D gravitational potential is practically zero, a point starting at the origin moving toward positive infinity along the surface of a one-sided Moebius strip, will find itself traveling back to the origin via negative infinity. Vice versa, a point, again, starting at the origin traveling toward negative infinity will find itself back to the origin via positive infinity. These distinctions are possible if and only if a unit circle is centered at the origin with fixed counterclockwise or clockwise rotation. See the images below.
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Steve . W here has all the time gone ? Your Time is my Spacetime.
