Harmonic forms refer to structures or patterns that exhibit harmony, often found in music, art, and nature. In music, harmonic forms involve the combination of different notes and chords that create a pleasing sound. These forms can be simple, like a basic chord progression, or complex, involving intricate arrangements that evoke emotions. In visual arts, harmonic forms can be seen in the use of color, shape, and composition that create balance and unity. Artists like Claude Monet and Pablo Picasso often employed harmonic forms to enhance the aesthetic appeal of their works. In nature, harmonic forms appear in patterns like the Fibonacci sequence or the symmetry of flowers.