29 “Imagine I set up an experiment where I show you a series of holographic images,” Dr. Venn says. “One after another, just a few seconds apart. A picture of a bicycle, a dog, a hat—that sort of thing.” “Okay.” “I program my machine to show you one hundred images in a row. Then once it’s done, I ask you to quickly list as many of the images as you can remember. That’s the test. That’s the only test you take.” “Okay.” I don’t see what this has to do with my question about the past, but I’ll let him tell it his way. “Then after the test, I have you sit and watch twenty-five of those same images again, chosen at random by the machine. And do you know what happens?” “I have no idea.” “You remember those images you saw twice better. Significantly better.” He pauses, smiling, as if what