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There is a joke about (optics)

Clever metaphor

One day, someone asked the British optical authority W·S· Franklin, "Why does an object look like it on our visual film?"

Inverted, and we don't feel that the object is inverted? "

Franklin thought for a moment and replied, "When you hear a baby crying in both ears at the same time, why can you be sure at once that it's not twins crying?"