Beyond meaning and truth | Bertrand Russell

We all start from "naive realism" meaning from the belief that things are what they appear to be, we believe that the grass is green, and that the stones are solid, and the ice is cold. But physics confirms to us. The greenness of the grass, the solidity of the stone, and the coldness of the ice are not the green spaces, solidity, and coldness we know through our own experience, but they are completely different things. When the viewer seems to see a stone, he is in fact, if we trust physics, noticing the effects of the stone on himself. And so it appears to him that science is at war with itself. When he wants to be very objective, he finds himself immersed in subjectivity against his desire.