A terrific exhibition of works by Dutch graphic artist M.C.Escher is at Naples Art.
I liked seeing some woodcut prints from his years in Italy. Escher began studying architecture before shifting over to art, and his Italian scenes foreshadow the later works for which he gained his reputation.
This is a corner of a 1935 wood engraving of a hall in St. Peter's Basilica.
You can how three years later Escher's thinking transformed a woodcut into white birds flying right and black birds flying left.