My brain (oh Pooh of very little brain) is wont to skip along from thought to thought not unlike a greased toboggan on a stretch of snow. On occasion though, it hits the tarmac or an unsnowed patch and sticks a little. And ..... then it’s off again. One of these skippity thought processes snagged on the thought about the masters of maths, Pythagoras, as an example; or da Vinci? What about...

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