On the other hand, even if we cannot see beauty in particular measured results, we can already claim to see a certain beauty in the equations which describe general physical laws. For example, in the wave equation (20.9), there’s something nice about the regularity of the appearance of the x, the y, the z, and the t. And this nice symmetry in appearance of the x, y, z, and t suggests to the mind still a greater beauty which has to do with the four dimensions, the possibility that space has four-dimensional symmetry, the possibility of analyzing that and the developments of the special theory of relativity. So there is plenty of intellectual beauty associated with the equations.

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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