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The type D Kasner vacuum solution of general relativity is reviewed,highlighting the little-known, intriguing property that it can describe both ananisotropic cosmology and the spacetime deep within a black hole, these twodescriptions linked by a reversal of the time-ordering of the solution. Theflexible nature of solutions of Einstein's equations is emphasised, and a briefdiscussion of the arrow of time in modern physics is presented.

Rewinding the Void: How One Solution of Einstein's Field Equations Describes Both the Birth of a Universe and the End of Time