Last year I read an article describing the mathematical structure of Escher’s Print Gallery. Escher’s Print Gallery (de Prentententoonstelling in Dutch) shows a man standing in an exhibition gallery, viewing a print of a seaport. As his eyes follow the buildings shown on the print
Escher and the Droste effect
![Escher and the Droste effect Escher and the Droste effect](https://reindernijhoff.net/wp-content/uploads/2014/05/escher_gallery-766x420.jpg)