Dorothy Cochran is teaching an online course on encaustic monotypes at Truro Center for the Arts at Castle Hill. “Students will learn about heat sources, encaustic wax, transparency, tools, papers, and water-based materials that can be used in tandem with the monotype,” according to the course description. There are four Thursday sessions, 10:30 a.m. to 12:30 p.m., beginning January 7th. Registration is $300 at castlehill.org.