An image containing itself to the infinity.
The Ultimate Escher’s Droste Effect - A logarithmic image transformation / HN

How (and why) to take a logarithm of an image (3Blue1Brown) / HN

• conformal map - using complex function to transform the complex plane
• elliptic function - doubly periodic function in the complex plane
• Artful Mathematics: The Heritage of M. C. Escher

online implementation

• escher / HN
• Eschers Print Gallery and the Droste Effect

see also

• Magic of MC Escher