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In this image, Dürer essentially combined two of his interests. Dürer lived in Nuremberg, the European center for the production of navigational tools, such as sundials, celestial globes, and astrolabes. A passion for instruments led him to collaborate with German mathematicians and instrument makers to engrave for celestial globes and design sundials. In the text, he makes an effort to detail how to join together rods, disks, and dials into one single instrument, arrange them in proportion to each other, and indicate the degrees on the dials for reference.
His desire to draw perfect linear geometry, however, was spurred by his trip to Italy and exposure to the study of proportion, mathematics, and perspective that exercised the imagination of the Italian Renaissance. A balance between theory and practice exists. Both the instrument and the book itself work between pure mathematics and workshop practice, and present classical knowledge of mathematics for practicing artists rather than theoreticians.
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