Given a seminar today at @UPCEdifica
about patterns on planar surfaces, focusing on the topology of their orbifolds. Here two examples of typical pavement patterns in Barcelona.

Building a turbidity tube to study runoff water in a green roof. Fill it with water until you can't see the Secchi pattern at the bottom.

Playing with kits to measure nitrates (L) and nitrites (R) from the water runoff from a green roof.

In John Colson's annotations of Newton's "The Method of Fluxions", page 162, we can find an ingenious method to "change Division into Multiplication", where "every Operation will at least double the number of Figures found by the preceding Operation". Could William Shanks be using such method for his reciprocal of primes? Reference:


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