Day and Night is a woodcut made by the Dutch artist M. C. Escher in 1938.

[1] The woodcut depicts a landscape mirrored horizontally with respect to the center of the image.

It has two cities, each with an associated river and an interlocking pattern of birds gradually appearing towards the top of the image making a tessellation.

Along the center, the image is divided into complementary black (right) and white (left), or, as the title suggests, day and night.

[3] Escher became interested in how forms could fit together to create what Sarah Lawson calls "paradoxical patterns", as when the black geese in Day and Night emerge from the darkened spaces between the white geese that are flying in the opposite direction.