Yeah, I know, too obscure. Read the annotations.

In a nutshell (because I couldn't find a decent, stable link), Kepler wrote a book with a title that translates as "Solid Geometry of Wine Barrels", and he has a wine-barrel problem named after him. I stumbled upon this recently (after starting this series, in fact) and thought that was better than actual showing (and creating) these mysterious Knights, who are too numerous to count (and actually aren't that important to the story, such as it is).

to be continued...

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