Ключевые слова: backpacks, books, boyhood, boys, casual, childhood, children, daytime, education, educational, friends, friendship, gesture, gesturing, girlhood, girls, hand stack, kids, outside, overhead view, people, preadolescent, preteen, schoolboys, schoolchildren, schoolgirls, schoolkids, sign, stacking hands, sunlight, symbol, together, togetherness, top view,