outsider art
self-taught art
vernacular art
naive art
primitive art

"Most of my life I have been involved in primitive art," he said.

"Primitive art had a tremendous influence on my early work."

None of his three sons has shown any interest in primitive art.

Like the early modernists, she has been a student of primitive art.

Less easy to find, yet very much a face of Brazil, is the appealing primitive art.

Once upon a time (not long ago), what people called primitive art was rarely seen in major museums.

Primitive art, however, was the star of the fair.

Both homeowners are painters with an appreciation of primitive art.

They are as unfamiliar as "primitive art" in the early years of the century.

His work makes reference to folk and primitive art.