I can see the difference between squares 14 and 18, though it's subtle. I can imagine a difference between 8 and 10! Retinas are really good at edge detection but not nearly as good at comparing colors when they're separated. For anyone planning to use these, note that the smallest feature is not necessarily the edge length of the smallest square. E.g. in problem 5, it's a piece of the lower edge of the upper right square and in problem 6 it's a piece of the lower edge of the upper left square. In #19, it looks like the smallest rectangle isn't a square. What's going on there? On Sat, Dec 14, 2019 at 7:57 AM Bill Gosper <billgosper@gmail.com> wrote:
http://www.tweedledum.com/rwg/squares.htm problem 2, can you see the color boundary between "18" and "14"? Maximal zoom. Slide "10" and "4" off the left edge to show only the middle right portions of "14" and "18". Slide up and down. Suspicion: Girls can see it better. Color vision is on the X chromosome. —rwg ("8" and "10" are identical shades of light blue. Proof: TextEdit>Format>Font>Show Colors> <eyedropper>.) I used to grumble at color-enhanced astronomy photos. Until I realized I am colorblind compared to most space aliens. _______________________________________________ math-fun mailing list math-fun@mailman.xmission.com https://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun
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