Bunter Aufbau c. 1923

Karl Wiener's "Bunter Aufbau" (c. 1923) exemplifies the artist's abstract style. This pencil drawing features a geometric composition of colorful, interlocking shapes, evoking a sense of movement and energy. The vibrant hues and playful lines create a dynamic interplay, hinting at the artist's interest in exploring form and color. The work likely reflects the burgeoning abstract art movement in Germany during the early 20th century.