Labels:text | screenshot | font OCR: sequence of thoughts that bring us into intimate contact with the workings of his mind. How, he asks, can we account for the center of gravity, given that rock strata of various densities and even water of varying densities are intermingled on the planet? Leonardo distinguishes three kinds of gravity, or centers, using categories developed by medieval scholastic writers. The simplest kind does not concern him for long because it is unproblematic: the geometric center of the planet. This is the "center of magnitude," B
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