Escher's most mind-bending piece

MC Escher's 1956 lithograph 'Print Gallery' is explored through a mathematical lens. The piece depicts a man viewing a painting that recursively contains the gallery itself. In 2003, mathematicians De Smit and Lenstra analyzed the underlying structure, revealing that the image is essentially a logarithmic transformation of itself. This analysis also answers what belongs in the mysterious blank spot at the center — a point where all spatial ambiguity in the recursive scene converges.