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1 This account of the derivation of the sense-world from the “starting-principle” (ἀρχή) is obscure. It is generally interpreted as a “geometrical allegory,” the stages of development being from point to line, from line to surface, from surface to solid,—this last only being perceptible by the senses (cp. Aristot. Soul 404 b 18 ff.).
2 The 8 kinds of motion here indicated are—(1) circular motion round a fixed center; (2) locomotion (gliding or rolling); (3) combination; (4) separation; (5) increase; (6) decrease; (7) becoming; (8) perishing. The remaining two kinds (as described below) are—(9) other-affecting motion (or secondary causation); and (10) self-and-other-affecting motion (or primary causation).
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