Judy Lindgren, the daughter of Harry Lindgren, and herself an inveterate explorer of exotic locales the world over, came up from Australia to visit us over the Easter weekend in 2002. As it can often be at the end of March in Indiana, the weather was still a bit wintry, and Judy couldn't get over the relative lack of bird calls that weekend. There were a few birds around, but most of them hadn't yet arrived from more southerly climes. So Judy had to put up with a different kind of bird---the model of my twist-hinged dissection of an equilateral triangle to a square:
Then she got a bird's-eye view of another kind of flapper, my model of a piano-hinged assemblage that will fold to give any of the twelve pentominoes (At first, I thought I had discovered this beauty, but at least two people had discovered the idea ahead of me. More about this in my next book!):
Did Judy report back to friends at home about the unique fauna to be glimpsed in this deceptively mundane land?
Copyright 2003, Greg N. Frederickson.
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Hinged Dissections: Swinging & Twisting
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Last updated January 27, 2003.