It’s a theory in which space and time are the same thing. We just can’t see it because we can only move and see in the 3 space dimensions, not time dimension, so our brains think it’s different.
Imagine a blind ant on a sheet of paper, there is no altitude there is only 2 dimensions for it, north/south and east/west. If it evolved in a 2D environment since millions of year it wouldn’t be able to comprehend the 3rd. It would be very hard to explain the ant that altitude is also a dimension in which some other species can move and see.
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