I also vote Dali: on the grounds that Escher's work, while interesting to
look at, is generally not much more than a manipulation of space. Once
people were sufficiently disoriented in EscherLand they would undoubtedly
become bored and seek CONTENT.
Enter DaliLand, where we are constantly challenged not only by unique
perspectives, but by symbolic objects, brilliant colors and textures,
surreal environments, and endless possibilities for extrapolation of ideas.
Not optical illusion, but mental illusion, which, in my view, is much more
interesting.
Ethan.