Leah Tether´s Master´s thesis, ― Beyond the Grail: The Roles of Objects as Psychological Markers in Chrétien de Troyes´Conte du Graal, ‖ examines Perceval´s perception of objects in the story and their gradual acquisition of deeper, symbolic interpretation as he matures.
Meistararitgerð Leah Tether, ― Beyond the Grail: The Roles of Objects as Psychological Markers in Chrétien de Troyes´Conte du Graal, ‖ skoðar skynjun Parsifals á hlutum innan sögunar og þróun þeirra yfir í djúpstæð, merkingarþrungin tákn samhliða vaxandi þroska riddarans.