You have the photo of the cake. You don't have what he said.
Go back through your camera roll to the last birthday. There's the cake, the candles, everybody squinting. What isn't there is what your grandson said when he blew them out, or who laughed first. A photo keeps what it looked like. A few lines in your own handwriting keep the rest. That's what the Momento is for, and it's pretty enough to leave out on the table, where you'll reach for it.

