Les ZFleurs des Mathématiques


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.

The Bird Dimension

M.C. Escher, Another World / Andere Wereld (1947)


This is almost my favorite image by Escher. But I’d like a frEscher perspective in it: I think the bird should be looking in the other direction, out into the impossibly overlapping universes, not into the cupola and at the viewer.