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M.N. Roy: "Some leading scientists say, `One has the idea of a tree, but one can never know whether the tree really exists or not because the content of the idea is the picture of the tree in the retina.' According to them, there is no way of ascertaining the connection between the picture in the retina and the tree supposed to be there at a distance; the latter may just as well be a projection of the idea. How do we know that the tree is the first and the picture on the retina is the second?"

-- Notebooks Category 21: Mentalism > Chapter 4 : The Challenge of Mentalism > # 261