funny story - short version... Duchamp history class.
Smart-ass kid "how do we know that they're not ascending the staircase?".
Lecturer "um well look at the bends in the leg, do you climb stairs backwards?"
Kid: "sure!", demonstrates, ambulance, head stitches.
Hello, Mrs. Obvious here pointing out how funnyand somewhat ironic that a Duchamp is the basis of this poster and discussion. Duchamp is redonkulous, agreed.
Also, it gets dark at night. You're welcome!