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Reading this reminded me of the feeling I had when I first understood what it means for spacetime to be four-dimensional and how an object that appears stationary is actually moving at the speed of light, but in the direction of time.

So, in reality, nothing’s ever just sitting still, everything’s always moving at speed c. You can't just "stop". We just have to choose how we’re moving that speed around—through the x, y, z, or t direction.



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