Unsurprisingly, several people reached out to me to say HEY NEW PENTAGON AMY, DID YOU SEE? I love you. You know me well. 

There are two kinds of people fascinated with the idea of finding shapes that can fill a two-dimensional plane: geometry professors, and quilters. What's weird, and sad, is that they aren't really talking to each other. I've corresponded with a few of them, and as far as I can tell, there are quite a few mathematicians who are working on these problems, but the number of quilters playing with the end results likely can be numbered on my fingers and toes.

I wised up with my book purchases some time ago. I realized I liked looking at craft books more than I liked owning them; I have a small-but-growing stack, and a realization that I don't actually need to keep many books. Keeping books leads them to eventually be part of cataloging and Keeping Up With and then sadly part of Clean ALL The Things. Those just aren't as fun.

My rationale: save my book-purchase money for the books that I just can't get through interlibrary loan, or books where $book->value > $cleanALLthethings->time.