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The Hoard Potato Bats an Eye
You know, I never quite believed in the Bat Signal. Sure, I've seen searchlights shining on cloud layers, but the idea that you could see a silhouette of something placed over the light, and see it so clearly, seemed like pure fancy.
I was, evidently, incorrect:
The same technique was used in the '30s, in England.
Gotham City is generally considered a fictionalized New York, of course.
I was, evidently, incorrect:
In New York City in the early 1890s, nighttime clouds served as projection screens for giant ads. A 3,000-pound lamp atop Joseph Pulitzer's World building beamed text and figures from the news or from sponsors onto the clouds; the messages were visible as far away as New Jersey and Long Island.
The same technique was used in the '30s, in England.
Gotham City is generally considered a fictionalized New York, of course.