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A comment on A mirror flips left and right, but not up and down. Parent comment

Re:A mirror flips left and right, but not up and down by InclinedPlane on Thursday July 21, 2011 @03:51PM (#2791000)
This works for any plane through the object, a mirror will appear to "swap" the object along that plane into its mirror image. Left/Right, top/bottom, front/back, even NNW/SSE.
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