Prompt Challenge & Pi Day

Bo Press Miniature Books, PIDue to a series of vexing computer and printer issues this past week, I didn’t make much progress on last week’s prompt challenge word, so I’m going to keep it for next week.
In the meantime, it’s PI Day tomorrow, March 14. I found this pi book by Pat Sweet on Etsy. She says:

This is a tiny book containing four recipes for Pi:
1. the ratio of a circle’s circumference to its diameter.
2. Wallis’ Product
3. the Gregory-Leibniz series
4. Viele’s Formula
– all running through the book in parallel , with increasing complexity. This sounds pretty dry, unless you’re a Pi-est, so I’ve sweetened the book with two magnificent endpapers, depicting a giant metallic PI lounging on a Hawaiian beach, and in a snowy Norwegian forest. The typeface was chosen to evoke memories of old elementary school textbooks.

Do check out all of Pat’s other fun miniature books here.