The whole question of imagination in science is often misunderstood by people in other disciplines. They try to test our imagination in the following way. They say, “Here is a picture of some people in a situation. What do you imagine will happen next?” When we say, “I can’t imagine,” they may think we have a weak imagination. They overlook the fact that whatever we are allowed to imagine in science must be consistent with everything else we know: that the electric fields and the waves we talk about are not just some happy thoughts which we are free to make as we wish, but ideas which must be consistent with all the laws of physics we know. We can’t allow ourselves to seriously imagine things which are obviously in contradiction to the known laws of nature.

Richard Feynman (1918-1988) American physicist

The Feynman Lectures on Physics, Vol. 2, ch. 20 “Solutions of Maxwell’s Equations in Free Space,” sec. 20–3 “Scientific Imagination” (1964)
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