These pieces are known for both their visual and their auditory functions. Abstraction was chosen to visually evoke the rhythm, melody, harmony, color (timbre), and texture—as well as the emotive power—found in music. Set against a blank background, these works' smooth, flowing lines and bright gradients of color are lyrical, spontaneous, and energetic. These elements make the pieces visually stimulating, and the calligraphic lines can also serve as actual musical notations, which have been played improvisationally in numerous concerts based on these works on paper.