It was the step heard round the world: On July 20, 1969, at 10:56 p.m. (EDT), Apollo astronaut Neil Armstrong became the first human being to set foot on the moon. People clustered around television sets and listened on the radio to the words Armstrong radioed back to Earth: "That's one small step for [a] man, one giant step for mankind." Artist Paul Calle took those grainy video images and produced his own illustration of that great, weighty moment.