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People who stopped drawing very early will tend to limit their doodles to repetitive geometric forms and the learned symbols from their childhood. In the early teens, when realistic expression and detail become important, children keenly feel an inadequacy in their ability to draw realistically, and stop drawing. They might add more complex forms later but rarely learn observational drawing. Children learn a set of formal symbols: the face, house, sun, moon, flower, tree, bird, fish, and basic geometric shapes that are established in early primary school.
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Usually, we have a limited visual vocabulary that we have at our disposal depending on the age at which our artistic development stalled. When we are otherwise occupied - on the phone, in a meeting or lecture, writing a list - basically, any moderately engaging mental activity with a pen in our hand the censor in our head can be turned off, and we allow ourselves to express the ideas that are locked in our head.
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