Georgia O'Keeffe. Black Diagonal, 1919. Charcoal on paper, 24 5/8 x 18 3/4 inches. Georgia O'Keeffe Museum (Santa Fe), Gift of The Burnett Foundation. © Georgia O'Keeffe Museum. [2007.1.12]
Vertical charcoal drawing with strong thick black line that runs diagonal across the page from the lower left increasing in thickness to the upper right. Through the middle is a more delicate curved line and a spiraling circular shape in the middle crossed by the main black line.