"Alejandro Amenabar is a different kind of director than I lot of the directors I've asked for. He really asks you to enter his dream as opposed to, you know, a guy like Sidney Lumet or something is going to ask you to create a character almost like a documentary. He wants you to make the people really real and he's going to capture it like a documentarian."

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He sought a way to preserve the past. John Hershel was one of the founders of a new form of time travel.... a means to capture light and memories. He actually coined a word for it... photography. When you think about it, photography is a form of time travel. This man is staring at us from across the centuries, a ghost preserved by light.

— Carl Sagan