OELEBRATING TANYA MOISEIWITSOH anada's Srratford Festival is marking its 40th season with an exhibition paying rribute to its founding designer. "Tanya Moiseiwitsch: Designs for Srratford" brings together drawings, costumes, properties, and models by the woman who, with Tyrone Guthrie, the Festival's first artistic director and guiding genius, established the permanent set and the thrust stage as a new standard for staging Shakespeare in the second half of the 20th century. A R ~ 0 J---J D TD&T 1992 FAll 21