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Children Helped Decorate Prehistoric Caves of France
sciencehabit writes "Among the prolific paintings and other art in the 8 kilometer-long Rouffignac cave system in southwestern France are a number of unusual markings known as finger flutings, which are made by people dragging their hands through the soft silt that lines the cave's walls. By analyzing the finger flutings of modern humans, researchers discovered that the ratio of the distance between the three middle fingers indicate that many of the cave artists were very young children, one as young as 2 or 3 years old. The researchers were also able to tell the children's genders from the shape of the fingers."
Some of the drawings were very high up so children had to have been lifted by adults to reach them. Moreover, there are clear designs in the patterns, and swirls and the like. They aren't just straight lines at height level. And as discussed at http://www.cam.ac.uk/research/features/prehistoric-pre-school/, the children's work was mainly confined largely to a single room.