ReasonMeThis

Have you ever wondered why a mirror appears to reverse images in the right-left but not the up-down directions? Before you start shouting things about z-axis inversion (which is what I did when I first encountered this question) you might want to keep in mind that the answer isn't as straightforward as you might think. Googling the question produces many different explanations, but it's surprisingly hard to find one that really gets to the crux of the matter.

So, give it some thought and let me know what you think. The best answer will be recognized and posted in next week's Brain Teaser.

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