I was sketching quick live portraits and also auctioned off a pen portrait drawing. Two little girls came over to me while swing dance lessons were going on and I asked if they would like their portraits done. They instantly started bugging their mom about it; after some thought, they were allowed to sit for me. Little children have an attention span of about 7 seconds. The departure of their attention is unlike a train leaving a station in that a train takes a while to make gigantic noises and ponderously build up steam, whereas a child makes gigantic noises but appears to have steam already built up. The two are similar in the sense of something being very obviously THERE and suddenly very obviously NOT. As a portrait artist, I am in a unique position of being able to observe the exact moment the child's fantastically vibrating excitement at having their portrait drawn suddenly and inexplicably disappears, and they are unable to sit still or think of anything except "Are you done yet?".