Art on walls is a broad term that encompasses many different forms of art. Murals and frescos are two of the most popular forms of art on walls. Murals are large-scale paintings or scenes that are painted directly onto a wall or ceiling. Frescos are a type of mural painting that uses water-based paint on wet plaster. Both murals and frescos are often used to decorate public spaces, such as churches, government buildings, and other public areas.