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Do not the rays of light falling upon the bottom of the eye excite virbations in the tunica retina? Which vibrations. being propagated along the solid fibres of the optic nerves into the brain, cause the sense of seeing?" These and the next sentences in Newton's Opticks describe what we call today the frequency code.doi:10.3109/00207458808991605 pmid:3061958 fatcat:dep3xebqsffr5fkqgjtlicjnsu