What are the key takeaways from “Escher's most mind-bending piece” on 3Blue1Brown?

What is this episode about?

M.C. Escher’s 'Print Gallery' creates a recursive loop that defies traditional perspective. Mathematicians Bart de Smit and Hendrik Lenstra revealed that the image’s central blank spot is not merely an omission, but a mathematical necessity resulting from a complex transformation known as the logarithm of an image, which resolves the work's inherent spatial paradox.