It's just a dance, right?

Actually, maybe that's the last thing the prom is. Maybe the photo is even more important, because it freezes you. It's your chance, as high school trickles away, to say "This is who I am. This will be who I was."

We've been looking at prom photos by Mary Ellen Mark, who will be on our show today, and they're striking in the range of emotional states they convey. We see joy, hesitation, confidence, detachment and some flat-out haunted looks.

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