I’ve always liked children’s drawings. One of my favorite books I read once breaks down the inherent symbolism and style that’s worldwide in children’s art as it reflects stages of human development – and then at some ages there are cultural splits where one national art style goes one way and another art style goes another way – around the same ages that socialization begins to shift around 7-8 years old, but particularly visible around age 11-12.
I took some developmental psychology at college; learned about the worldwide nature of certain children’s cultural phenomenon — even pre-internet children tended to pick up similar kinds of stories at similar ages, just as language learning flows similarly.