Labels:text | screenshot | font OCR: phenomena to create a marbled mass. He then returns to the theme of subterranean waters that erode the earth's interior, causing caverns to collapse. As these caverns crumble, water fills them, which explains why the seas remain at a constant level and why the earth remains in balance. This idea, familiar to Leonardo through Ristoro d'Arezzo, is the most innovative visual model of the dynamic balance of the world in the entire codex. Cross-sectional diagrams B indicate how the layers of earth and water continually fold in upon themselves, pulled toward the center by gravity, pushed toward
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