M. C. Escher once explained, “I try in my prints to testify that we live in a beautiful and orderly world, and not in a formless chaos, as it sometimes seems. My subjects are often also playful. I can’t keep from fooling around with our irrefutable certainties. It is, for example, a pleasure knowingly to mix up two- and three-dimensionalities, flat and spatial, and to make fun of gravity. Are you really sure that a floor can’t also be a ceiling?” This compact wall calendar presents twelve of Escher’s unmistakable creations, including Hand with Reflecting Sphere, Magic Mirror, and Relativity.