When my oldest son was two years old, we took him to a portrait studio to have his picture taken. Two-year-olds are a bundle of emotions, and getting them to sit still through a photo shoot is a real challenge. During that short session, my son went through a range of moods, from contentment, to laughter, to pouting, to anger, to tears. I remember getting the proofs afterward. The first showed him serenely content, smiling at the camera. In the second, he was laughing delightedly