Beautiful curved grid?

Author
OSjerick
View Count
986
License
Creative Commons CC BY 4.0
Abstract

A variant and a combination of Hering's and Zöllner's illusion. The red grid is completely straight all the time.

Submitted as an answer to the Showcase of Optical Illusions question on TeX SX.

Click the Illusions tag below to see more!

Beautiful curved grid?