Hans Hartung's "P1967-21" is an acrylic work on cardboard created in 1967, exemplifying the artist's mature abstract expressionist style. The work features Hartung's characteristic dynamic linear gestures and energetic brushstrokes, which convey movement and spontaneity across the cardboard surface. As part of his prolific cataloguing system, this piece reflects his exploration of gesture as a primary means of artistic expression, emphasizing the act of painting itself over representational content.