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The Problems of Philosophy - Russell, Bertrand ยท 73 words
Now this something, which all of us who are not blind know, is not, according to science, really to be found in the outer world. it is something caused by the action of certain waves upon the eyes and nerves and brain of the person who sees the light. When it is said that light is waves, what is really meant is that waves are the physical cause of our sensations of light.
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