Modern Aboriginal art still uses traditional symbols. While the meaning of the symbols can be the same across Australia, they can also change within in a single painting. A symbol such as a circle can be used as a circle within a circle, sometimes on its own or clustered in groups. The meaning can depend on which tribe the artist is from. The circles could be campfires, trees, hills, digging holes, water holes or a spring. The meaning can be changed by the use of colour, so water could be blue or black.