Juola, Patrick. Six Septembers: Mathematics for the Humanist. Zea Books, 2017 — 116-bet. ISBN 978-1-60962-111-7. „By putting a picture inside a picture, you get a progression of suggessively smaller, but self-similar images (the box of Droste cocoa has a picture of a woman holding a box of Droste cocoa... ). In theory, this nesting could go on forever into infinite detail, but in practical terms, the resolution of the image limits how it's actually drawn.“
