Dave W Plummer richard feynman explains it well

One of my favorite Microsoft interview questions was: "Why does a mirror invert the image horizontally but not vertically? Why are you backwards but not also upside down?"

@davepl1968 Now I gotta google what keeps a train on the track!

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@davepl1968 I freaking love Feynman so much. The way he described this just reminded of a quick trick in game dev/3D/graphic design to mirror something... scale it/flip it in the negative. I made this GIF to illustrate. When you scale a cube in the negative it mirrors itself.

@davepl1968 Makes me feel a hell of a lot better that a young Richard Feyman also didn't intuitively know the answer

@davepl1968 i love his explanations! always genuine explanations. always makes me smile. never makes me feel stupid

@davepl1968 Richard Feynman does a great job of explaining why this is a shitty technical interview question, and indirectly, why Microsoft launched irrelevant crap for about 25 years.

@davepl1968 I don't get it. If you lie down and look at a mirror , the hair is still on the left side. He kinda mumbles around at this point so i don't get the relevance.

@davepl1968 We’re incredibly fortunate that cameras were there to capture Feynman’s brilliant insights and profound words.