House of Stairs
House of Stairs is a lithograph print by the Dutch artist M. C. Escher first printed in November 1951. This print measures . It depicts the interior of a tall structure crisscrossed with stairs and doorways. A total of 46 "wentelteefje" (imaginary creatures created by Escher) are crawling on the stairs. The "wentelteefje" has a long, armored body with six legs, humanoid feet, a parrot-like beak and eyes on stalks. Some are seen to roll in through doors, wound in a wheel shape and then unroll to crawl up the stairs, while others crawl down stairs and  wind up to roll out. The "wentelteefje" first appeared earlier the same month in the lithograph "Curl-up". Later that month, "House of Stairs" was extended to a vertical length of in a print titled "House of Stairs II" by repeating and mirroring some of the architecture and creatures.