Thanks for the sleuthing. I found them myself by searching for Cosmati mosaics, since Wikipedia mentions them in the article about the Sierpinski triangle. Ca

Thanks for the sleuthing. I found them myself by searching for Cosmati mosaics, since Wikipedia mentions them in the article about the Sierpinski triangle. Captions for the two images: Francesco De Comité took this photograph in the Church Santa Maria in Trastevere, Rome, Civita Castellana - Santa Maria Maggiore - Motivo detto "setaccio di Sierpinski"