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https://protectingsight.com/2020/10/30/protecting-sight-139-how-a-penny-can-make-you-feel-like-a-millionaire-phaco-chop-the-ontt-leonardos-obsession-with-divine-proportion-and-squaring-the-circle/
Protecting Sight #139: How a penny can make you feel like a millionaire. Phaco chop & the ONTT. Leonardo's obsession with divine proportion and squaring the circle