The selection on display has been chosen by a panel that includes Grayson Perry, an artist whose own work is very much inspired by outsider art - that is, art by prisoners and psychiatric patients. Such work has had a huge influence on the development of modernist art, so it's certainly interesting to see that influence feed back on the prisoners themselves. You'll find, for instance, Dubuffetlike graffiti scrawls scratched into the surface of thick paint, as well as obsessively detailed drawings. Garvey Thompson's two engaging 'naive' selfportraits (pictured) are just a couple that stand out.