Although the subject wasn't addressed by many of the traditional masters, contemporary artists have been increasingly fascinated with studying and depicting the brightly unique colors that appear naturally inside of a rainbow. Modern graphic artists incorporate the bright colors in saturated hues that are usually combined with other disparate objects such as animals. Children's illustrations are usually in flat styles, with slightly more muted colors, and contain a sense of innocence and hope that few other forms of this art category achieve. These illustrations can vary considerably according to the purpose of the work, but generally the rainbow isn't the main subject. Rainbow art for children typically serves to frame or enhance the main subject rather than being the subject in its own right. Photographic forms of rainbow art, on the other hand, might contain other elements but the main subject is usually the rainbow. Unlike canvas art which can subdue the vibrancy innate to rainbows, photography must remain true to the hues presented in nature. Because of this, the rainbow commands immediate attention from the viewer and is usually depicted as the main subject with other objects serving as enhancement.