Arrgghh, my bad. http://otterrun.info/wp-content/uploads/2018/02/black-and-white-bathroom-flo... —rwg On Sun, Jul 21, 2019 at 8:40 PM Brad Klee <bradklee@gmail.com> wrote:

I did not see an image. Math fun may scrub those automatically. I would suggest pasting a link to some other host site, or else others will have similar confusion. --Brad

On Sun, Jul 21, 2019 at 10:34 PM Bill Gosper <billgosper@gmail.com> wrote:

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On Sun, Jul 21, 2019 at 7:53 PM <bradklee@gmail.com> wrote:

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This is not making sense to me, did you forget something??

Quite possibly. Did you you get an image? Did you zoom it enough to see the hexagonal tiles? I don't think I needed to say "geometrically

square grid".

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Can you propose a something that would make things sensible? —Bill

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On Jul 21, 2019, at 8:03 PM, Bill Gosper <billgosper@gmail.com>

wrote:

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I'm pretty sure this is the pattern in Oren's Hummus bathrooms on

Castro St;

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Can you find a short proof or disproof that the dark tiles form a

square

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grid? —Bill (During the 70s, I stared at (slowly, in those days) evolving Life patterns so habitually that the AI Lab bathroom tiles would run a couple of steps when I looked down. But those were square tiles, randomly dark and light.) _______________________________________________ math-fun mailing list math-fun@mailman.xmission.com https://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun