The term "outsider art" was first used by art historian Roger Cardinal in 1972 to loop together art made by people living with certain disabilities, as well as those living on the outskirts of society. Unlike most other art movements, outsider artists don't have much in common besides straying from the norm. They work in different media, throughout different times and places, without shared assumptions or aesthetic styles.
In fact, most outsider artists have or had no idea they would be categorized as such -- or even that their art would be seen by someone other than themselves. Therein lies the conundrum -- is a celebration of outsider art redemptive tribute or exploitation?