There’s a Kids in the Hall comedy sketch from the mid-1990s that begins with a police officer leaning against his cruiser. He’s approached by a second officer.
“Partner, you want to see a picture of my trip to Europe?”
It turns out to be the only photo he has of the trip (he took another, but it didn’t turn out). It seems absurd to let one photograph tell the story of an entire vacation. But then again, what’s a postcard? A single image tasked with summing up the experience of a certain place.