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Space folding, sure. It essentially amounts to time folding, and time is as real a dimension as length, width, and heighth. As a three-dimensional being, you are able to verify it through a simple thought experiment.
Imagine yourself anywhere on Earth, and begin walking in a continuous straight line. Although you will never turn around, you will eventually wind up in a place that is one step before your starting point. The third dimension was folded back upon itself to make a sphere, and you could have arrived at the same ending point by stepping in the other direction with one simple step.
The fourth dimension should be equally malleable.
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Living is easy with eyes closed.
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