We all start from “naive realism,” i.e., the doctrine that thingsare what they seem. We think that grass is green, that stonesare hard, and that snow is cold. But physics assures us that thegreenness of grass, the hardness of stones, and the coldness ofsnow are not the greenness of grass, the hardness of stones, andthe coldness of snow that we know in our own experience, butsomething very different
-Bertrand Russell
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