PS - I remember one day in the Tate my art lecturer telling me you could teach a monkey to paint like Afred Wallis, to which I replied that unlike Wallis, no monkey would ever be moved to paint like that without being taught. Remembering that makes a sort of sense I suppose, and I still love Wallis for all sorts of reasons.

There's a church on the Norfolk coast (at Salthouse, now an art gallery!) on the stalls of which the choir boys of old engraved graffiti of sailing ships. Over all it's a palimpsest of crude maritime images, but the effect, like Wallis, is utterly beguiling. But like I say, Folk Art is invariably a matter of perception rather than intention...

http://norfolkcoast.co.uk/curiosities/cu_churchgraffiti.htm