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A spacetime mirror is a hypothetical construct in speculative physics and science fiction that reflects not just the three spatial dimensions but also the time dimension. Unlike a standard 3D mirror, which reverses light rays along an axis perpendicular to its surface, a spacetime mirror would reverse along a hyperplane perpendicular to 3+1 spacetime dimensions. The concept serves as a thought experiment to explore the complexities of higher-dimensional spaces and the nature of time.
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