Abstraction is one of the great discoveries of intelligence. Human genius discriminates between the orange and the color of the orange. From concrete reality it passes to the general idea of color, the quality of the color. Seduction and fecundity of the process. (The realism of the Middle Ages.) Power of higher mathematics in the modern world. Penetration of the methods of scientific-technological thought into all of cerebral life, even as far as sensibility. Its effects: enriching of the intellect by an increase in the number of available signs; economy of symbolic thought; destruction or
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