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Keywords: 4Fold Root Figure 2.jpg Figure 2 from The Fourfold Root of the Principle of Sufficient Reason by Arthur Schopenhauer Adobe snapshot from the scanned original book to be found at http //www archive org/details/onthefourfoldroo00schouoft Internet Archive org 1813 Creator Arthur Schopenhauer PD-old-100 On the Fourfold Root of the Principle of Sufficient Reason Optics diagrams of the human eye |