A segment on NPR this week on the return of the show Mad Men featured a clip of the character Don Draper, played by Jon Hamm, making an inspired pitch about the Kodak carousel projector. It's really an homage to the magic and seduction of photography.
In his pitch, Draper talks about using nostalgia as a way to create a "deeper bond with the product ... it's delicate , but potent..."
"...nostalgia literally means the pain from an old wound ... it's a twinge in your heart far more powerful than memory alone. It's a time machine - goes backwards, forwards... it takes us to a place where we ache to go again..."