Light travels in straight lines with relatively little diffraction.
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Pierre de Fermat (1601-1665) France, "principle of least time". Pierre Louis Moreau de Maupertuis (1698-1759) "principle of least action" in 1747 or 1750? Maupertuis hoped that the principle might unify the laws of physics and support his proof of the existence of God.
The wisdom of Beekman. "We don't see things. We see light bouncing off things."
A plane mirror produces only one inversion: front-to-back. This is called a perverted image.