If there is one recurring theme of childhood, it's that you, as the parent, get to relive and appreciate the wonder of the world through your child's eyes as he explores and discovers. Things that were previously mundane take on new levels of meaning and value. And you remember to marvel at the beauty in simple things.
I got my first spontaneous bouquet of flowers from my three-year-old the other day. They're the most beautiful things I've ever seen.