Escher was a Dutch graphic artist now famed for prints in which he combined realistic detail with impossible perspectives to achieve bizarre optical illusions, such as staircases that appear to lead both up and down from the same level. He created visual riddles, playing with the pictorially logical and the visually impossible. Though his works have a strong mathematical component, they appeal to mathematicians, scientists, and the public alike. What creature is featured in his final print? Discuss
Source: The Free Dictionary