Murals are important in that they bring art into the public sphere. Due to the size, cost, and work involved in creating a mural, muralists must often be commissioned by a sponsor. Often it is the local government or a business, but many murals have been paid for with grants of patronage. For artists, their work gets a wide audience who otherwise might not set foot in an art gallery. A city benefits by the beauty of a work of art.
Murals can be a relatively effective tool of social emancipation or achieving a political goal. Murals have sometimes been created against the law, or have been commissioned by local bars and coffee shops. Often, the visual effects are an enticement to attract public attention to social issues. State-sponsored public art expressions, particularly murals, are often used by totalitarian regimes as a tool of mass-control and propaganda. However, despite the propagandist character of that works, some of them still have an artistic value.