What was the subject matter M.C. Escher painted?

M.C. Escher is renowned for his intricate and mathematically inspired artworks that explore themes of perspective, symmetry, and infinity. His subjects often include impossible constructions, tessellations, and reflections, blending elements of reality and illusion. Escher's works frequently feature architectural forms, natural landscapes, and animals, presented in a way that challenges the viewer's perception of space and dimension. Through his unique approach, he invites contemplation on the nature of art, mathematics, and reality.