Sol LeWitt. 1977. Six Geometric Figures (Circle, Square, Triangle, Rectangle, Trapezoid and Parallelogram)
Agnes Martin, 1971. Series of 30 prints that establish a visual grammar and system of linear division that guides her work for the rest of her life.
Thomas Merton, 1951. Quotes from a book that defines Christian mysticism through the lens of Saint John of the Cross and Saint Thomas.