The Medford Public Library continues its second Sunday series of online lectures meant as an introduction to African Art, its variety of forms, the depth of its history, and how it became an important player first in Western culture and continues to be important in a global world. Today's session is "Art in Cultural Context: Contrasting Cultures – Contrasting Styles - The Dogon of Mali and the Yoruba of Nigeria." The Dogon, living in the harsher world of the Western Sudan,…