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An Ulam Spiral is a pattern of numbers, a spiral arrangement of prime numbers. This image is the result of layering 2000 "Iterations" of the Ulam Spiral. An "Ulam Iteration" is a term I coined when I came up with the idea of skipping squares in the integer spiral to reveal new structures. I just wanted to see what it l...
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A ten story shaft at the center of the old International Shoe building contains spiraling slides, a window into the "caves" portion of the museum, and (apparently) an organ. www.citymuseum.org

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