Light propagates and spreads not only directly, through refraction, and reflection, but also by a fourth mode, diffraction.
Lumen propagatur seu diffunditur non solum Directe, Refracte, ac Reflexe, sed etiam alio quodam quarto modo, Diffracte.
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Physico-mathesis de lumine, coloribus, et iride, aliisque adnexis libri duo: opus posthumum, published in Bologna (1665), books.google.com Proposition I.