This exhibition of West African photographer Seydou Keita includes the riveting black-and-white portraits that have won the admiration of art lovers in Europe, Japan and the United States. The subjects of these portraits are mainly travellers who stopped by Keita’s studio, located in Bamako, the capital of Mali and one of the most bustling crossroad cities in Africa. The Museum of Contemporary Art has paired the show with a dozen 1935 Walker Evans photographs of African masks from the New York Museum of Modern Art collection.