An attractive and intriguing image by Kristina Armitage for an article on Zermelo-Fraenkel set theory at Quanta Magazine (click for larger image).

Post-Performative Post-Scriptum

The title of this post is a pun on Charles Baudelaire’s Les Fleurs du mal / Flowers of Evil (1857). If you’re already familiar with the book, you might have missed the “ZF” of ZFleurs.