Handwritten on front, "At Lake Merritt. Barbara Alesanders P.E. class from nearby St. Paul's Episcopal School plays a game called "elbow tag" wherein a person ("it"), in this case Henri Wood, age 13, Rt, is chased by another (Left: 13 yr old Michelle Wong) to be tagged out unless he can get to one of the groups of two standing (background) in a large circle arm in arm (elbow to elbow) & tag someone else. The idea is to wear the kids out.