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Math, or more exactly "living tissue in the humanities side of geometry"
 
Here's a bunch of fun geometry tidbits. Some are just polished versions of posts from here... but there's a lot more on the mystery of did Leonardo da Vinci use the golden ratio in his art? I used to think it was unlikely, and almost impossible to know for sure. Now I think it's more likely... but we can come closer to settling the question by reading a certain book published in 1509. There are only two copies of this book with all the pictures, which were drawn by Leonardo. But - haha! - it's also available for free online!
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