A man and his son walking to preschool, they cross the street in front of my car so I stop and wait. The dad is tall, in a suit, serious. The boy is 4ish, in shorts. They are holding hands. The dad is focused on the school on the opposite side of the street as he strides purposefully forward. The boy, however, is jumping his way across the street, from one white crosswalk square to the next, with his own sense of determination, similarly purposeful, yet completely with glee. They are a funny duo on the same trajectory yet oblivious to one another's mode of ambulation.