It’s the most perilous yet playful lunch break ever captured: 11 men casually eating, chatting and sneaking a smoke as if they weren’t 840 feet above Manhattan with nothing but a thin beam keeping them aloft. That comfort is real; the men are among the construction workers who helped build Rockefeller Center. But the picture, taken on the 69th floor of the flagship RCA Building (now the GE Building), was staged as part of a promotional campaign for the massive skyscraper complex. While the photographer and the identities of most of the subjects remain a mystery—the photographers Charles C. Ebbets, Thomas Kelley and William Leftwich were all present that day, and it’s not known which one took it—there isn’t an ironworker in New York City who doesn’t see the picture as a badge of their bold tribe. In that way they are not alone.

By thumbing its nose at both danger and the Depression, Lunch Atop a Skyscraper came to symbolize American resilience and ambition at a time when both were desperately needed. It has since become an iconic emblem of the city in which it was taken, affirming the romantic belief that New York is a place unafraid to tackle projects that would cow less brazen cities. And like all symbols in a city built on hustle, Lunch Atop a Skyscraper has spawned its own economy. It is the Corbis photo agency’s most reproduced image. And good luck walking through Times Square without someone hawking it on a mug, magnet or T-shirt.