In the Yam Period, there was a movement away from stick figures to a more naturalistic shape. However, they didn't go as far as the Modern Style, which is known as "x-ray" because it actually makes a feature of the internal skeleton as well as the organs of animals and humans. The Yam style of painting got its name from the fact that it featured much curvier figures that actually resemble the vegetable called a yam, which is similar to a sweet potato. The Modern paintings are interesting because they include paintings at the time of the first contact with European settlers. Aborigines managed to convey the idea of the settlers' clothing by simply painting the Europeans without any hands, indicating the habit of standing with their hands in their pockets. Size is another characteristic. The more recent images tend to be life size or even larger, but the Dynamic figures are painted in a miniature. Aboriginal rock art also records the environmental changes that occurred over thousands of years.