Tonight, my son asked me what sound memory makes. We were driving home after a day of work, for me, and day care, for him. I think I understand the origins of the question. He's learning his letters and their associated sounds, and we were recently talking about the game "Memory", wherein you try to recall what's on the face of upside-down cards in order to match them. Last night, he asked why the game was called "Memory" and I tried to explain what it is to remember. I didn't attempt to explain the shades and ghosts of sensations that comprise memories. Knowing how he came to the question didn't make it any less profound for me.