Thresholds, after Paul Klee

In der Strömung sechs Schwellen (In the Current Six Thresholds) - Paul Klee This is a beautiful geometric abstract. I loved the fraction and multiplicative structure so tried to make it. My problem was the rectangles were made in a list, so were all the same color. This sketch implements a spreadsheet workaround that Simon (user slik) gave me on the forums, but there's also a javascript option worked out by Chris Rime. See the forum thread for details. Thanks to both!
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