River School: the art and science of rivers with 4e and Manitoulin Streams Expositor Staff Aug 31, 2016 - 4 min read Sarah King Gold teaches watercolour technique as part of the River School. Sarah King Gold teaches watercolour technique as part of the River School. This post is for paying subscribers only Subscribe now and have access to all our stories, enjoy exclusive content and stay up to date with constant updates. Subscribe now Already a member? Sign in