Still Life with Spherical Mirror, 1934

A figurine of a Persian bird-man stands on newsprint and smiles at a narrow-necked vase, which is polished to a mirror sheen. Reflected in the vase is the bird-man, and Escher himself doing the sketch, with a room around him.
Still Life with Spherical Mirror, 1934. M.C. Escher.

The Persian bird-man sculpture was given to Escher by his father-in-law.
The sculpture is on my wishlist of things I doubt I’d ever be able to get.