Thalia stands as a definitive work of the Colour Field movement. Expanding on the visual language first developed during the Emma Lake Workshops, 1970 occupies a distinctive position in Perehudoff’s oeuvre, between the structured clarity of hard-edge abstraction and the atmospheric playfulness seen in contemporaries such as Olitski’s Core paintings. In Thalia, bands of colour arc, press, and lean against a dominant circular form, creating visual tension and resolution across the canvas. The work exemplifies Perehudoff’s commitment to pure, open colour while simultaneously asserting a rigorous formal architecture. Despite maintaining a studio practice on his farm in Saskatchewan, Perehudoff’s artistic concerns were decidedly international. Thalia was included in the touring retrospective The Optimism of Color, organized by the Mendel Art Gallery, which was exhibited at five major Canadian art institutions. The Thalia series has since been recognized as a significant body of work, contributing to the reassessment of Perehudoff’s role in shaping both national and international discourses on Post-War Abstraction. Works from this series are now held in the permanent collections of the Art Gallery of Alberta, the Art Gallery of Nova Scotia, and the MacKenzie Art Gallery.