"It is manifest that everything in the world, whether it be substance or accident, produces rays in its own manner like a star... Everything that has actual existence in the world of the elements emits rays in every direction, which fill the whole world."
— Light

January 1, 1970

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Added on April 10, 2026
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Original Language: English

Sources

, De Causis diuersitatum aspectus et dandis demonstrationibus geometricus super eas, also known as De Aspectibus (ca. 860) as quoted by , Theories of Vision from Al-kindi to Kepler (1976)