Native American rock art is of two types, “petroglyphs” and “pictographs”. Petroglyphs are images carved into the rock surface. Pictographs are images painted on the rock. There are a few examples of a combination of the two.
It has also been shown that rock art objects can be divided into two broad categories — private and public. Those considered private were clearly intended for only the individual that created them. They tend to be small images located in protected settings out of the view of most passersby. Public images are large, located in prominent places, and often very colorful.