Focus on Castrovalva (M. C. Escher) and discuss the In popular culture.
In 1982 the name "Castrovalva" was used in a story in the BBC television series Doctor Who. The storyline also relied heavily on recursion, a favorite theme in Escher's later and more famous works, and used ideas taken from Belvedere, Ascending and Descending, and Relativity to trap the protagonists in the city of Castrovalva.
The comic Kingdom of the Wicked is set in an imaginary world named Castrovalva.
Castrovalva a story Relativity Belvedere recursion BBC Ascending and Descending Kingdom of the Wicked Doctor Who