Many of the pictures I take have a lifetime, sometimes measured in hours or minutes. A restaurant I passed by before dinner that I'd like to check out later in

Many of the pictures I take have a lifetime, sometimes measured in hours or minutes. A restaurant I passed by before dinner that I'd like to check out later in the evening; a sign in a language I want to translate; a visual demonstration of where I am so people know where to find me in a busy train station; any number of things whose worth is almost immediately used up and subsequently deleted.