What type of drawings did Georgia O'Keeffe make in 1915 that helped establish her abstract style?

Georgia O'Keeffe made a series of charcoal drawings in 1915 that helped establish her abstract style.

The drawings reduced forms to lines, curves, and areas of tonal contrast rather than depicting recognizable objects in a traditional way. O'Keeffe later described these works as among the first purely abstract drawings produced in the United States.

She sent several of the drawings to Anita Pollitzer, a former classmate from the Art Students League. Pollitzer showed them to Alfred Stieglitz, who exhibited them at his New York gallery in 1916 without O'Keeffe's initial permission. That exhibition became a turning point in her public career.

The 1915 works were not her only abstract experiments. She continued exploring abstraction in paintings and drawings while also developing recognizable flowers, landscapes, bones, and architectural forms.