What is it to remember a photograph instead of the real thing? To know a picture by heart so well and to recall it accidentally as fact, is this really so different from remembering the flesh-and-bone event that also unfolded in image after image after image? Of course it is different, except not nearly as much as we want it to be, or think it should be, because memory is an invention in the same vein as Instagram or the video camera and we understand it now primarily in relation to all the devices we have built to emulate it. What did memory look like before photography? No one knows. No one remembers. No one is alive to tell us what recollections looked like before we had things that could freeze time and preserve its remnants.