If there were such things as mental pictures, Ryle implies, our experience would differ markedly from what it is.2 So we assume that the illusion of immanence is linguistic rather than factual. People are not mistaken when they report having imagery. In denying that there are such objects as mental pictures, Ryle is not, as he has been at pains to stress, 'denying well-known facts about the mental life of human beings'; rather, he is appealing to such facts in order to 'rectify the logic of mental-conduct concepts'.3