Sometimes I try to imagine how it must be in Grandma's mind. When she is not confused, I think it could be a pretty zen-like state. Her memory is so bad that she lives almost totally in the present. Everything is fresh and new to her.
For example, today I took her out to McDonald's courtesy of Middle Bro's gift card to her. She was super excited to get it in the mail, so much so that she carried it around the house all evening. I had to keep tabs on her to make sure it didn't end up lost in one of her mysterious hiding spots. Anyway, on our way to Mickey D's, she saw the Christmas lights by the local churches. "Oooh, look at the lights! How nice! Oh, look at the colors on that one. Isn't that lovely."
On the way home, barely 45 minutes later, she had the exact same reaction of wonder.