Although they lived in different eras, Norbert Ghisoland (1878–1939) and Seydou Keïta (1920–2001) both made studio portraits that captured the complicated nuances of entire communities. Ghisoland, a Belgian, photographed workers from his hometown, the coal-mining region of “Le Borinage,” during a complicated time. Keïta, born in Mali, made portraits of fellow members of the Malian community, documenting their elegance. The gallery, celebrating its 20th anniversary, displays the artists side-by-side, creating an unanticipated effect. —E.C.