teaching machines

Flips and Twists

Living in the Southern Hemisphere after a lifetime in the north draws one’s attention to geometric concerns. I regularly trace a path through time and space to remind myself if I am 15 hours ahead of my colleagues back home or behind. Different stars light up the sky. Many phenomena, like the seasons, flip. But not all. My oldest son wondered the other day if the sun rises in the west here.

Speaking of flip, here’s a 50-cent coin from Australia.

I have a geometric concern with this coin. Why did they not rotate the text and profile of Elizabeth by 15 degrees so she could stand straight when stood on edge?

But we have this problem in America too. Our public figures are quite crooked.

Comments

  1. Andy says:

    Interesting thought. So the figures look up 15 degrees I think.

    1. Chris Johnson says:

      I posed to my 8-year-old son the problem of how many degrees we needed to shift the dodecagon to make the queen stand upright. He generated some numbers, but he’s still working on it.

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