What unique characteristic defines illustrations in graphic design?

Illustrations in graphic design are defined by their unique ability to be manipulated for artistic expression. This characteristic emphasizes the flexibility and creativity involved in the process of creating illustrations. Artists can adapt shapes, colors, and styles to convey different moods, themes, or messages, making illustrations a powerful tool for visual communication.

The possibility of manipulation also highlights the difference between illustrations and other graphic elements, such as photographs, which are typically fixed in their original form. Moreover, this adaptability allows designers to experiment with various techniques, styles, and digital tools, producing unique and innovative results tailored to a specific project or audience.

While other methods such as black and white artwork, computer software, and physical materials play important roles in illustration, they do not capture the essence of what makes illustrations particularly valuable in graphic design: the creative freedom and artistic expression that can be achieved through manipulation.