Dennett's "Consciousness Explained" (1991) is an inspiring but also a highly frustrating book. The line of the argument seems to be clear, but then at second sight it fades away. It turns out that Dennett uses six of the seven strategies which I discuss in my 'The Seven Strategies of the Sophisticated Pseudo-Scientist: A Look into Freud's Rhetorical Tool Box' (J. Gen. Phil. Sci., 2001) Discussing important examples of these strategies I show why "Consciousness Explained" is such a frustrating book. (...) As the examples used do not reflect minor problems but go to the heart of the matter and concern the book's main areas of contention, it turns out that, in spite of the valuable and insightful details, Dennett's materialistic view of consciousness is supported mainly by rhetorical sleights of hand. (shrink)

John Hyman has used the objective character of occlusion shapes and of relative occlusion sizes to develop a more objective approach both in the analysis of linear perspective and in the theory of depiction. To this end Hyman develops two Occlusion Principles, plus an Aperture Colour Principle (which I do not discuss), which, together with our knowledge of appearances, are supposed to tell us what a picture depicts. I argue that Hyman underestimates the crucial role of the psychological element in (...) the work that the objective occlusion shape and relative occlusion sizes are assigned to do. Two pictures may have different contents in spite of the same occlusion shapes and the same (relative) occlusion sizes. It is the operation of constancy scaling in pictorial space which frustrates Hyman’s objectivism both in the domain of linear perspective and in the domain of depiction. (shrink)