I’ll tell you what I see. I see some kind of vague showy, wiggling lines — here and there an E and a B written on them somehow, and perhaps some of the lines have arrows on them — an arrow here or there which disappears when I look too closely at it. When I talk about the fields swishing through space, I have a terrible confusion between the symbols I use to describe the objects and the objects themselves. I cannot really make a picture that is even nearly like the true waves. So if you have difficulty making such a picture, you should not be worried that your difficulty is unusual.Prof Richard Phillips Feynman (1918-1988)
Source: Feynman, R P, Leighton, R , & Sands, M (2011), The Feynman Lectures on Physics, Vol II, New York: Basic Books.
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HT: Dr John D Cook
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