"Do not the Rays which differ in Refrangibility differ also in Flexibity; and are they not by their different Inflexions separated from one another, so as after separation to make the Colours in the three Fringes above described? And after what manner are they inflected to make those Fringes?"

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But till all graces be in one woman, one woman shall not come in my grace. Rich she shall be, that's certain; wise, or I'll none; virtuous, or I'll never cheapen her; fair, or I'll never look on her; mild, or come not near me; noble, or not I for an angel; of good discourse, and excellent musician and her hair shall be of what colour it shall please God.

— William Shakespeare