What I Learned Today: Outside Art - Souzou

‘Outsider Art’ has since become an internationally recognised term, commonly used to describe work made by artists who have received little or no tuition but produce work for the sake of creation alone, without an audience in mind, and who are perceived to inhabit the margins of mainstream society. 

http://www.wellcomecollection.org/whats-on/exhibitions/souzou/introduction.aspx