The Wilhelm-Hack-Museum is the municipal art museum, with collections spanning from ancient to contemporary art. It is known for the emblematic Miró mural covering an entire façade, called the "Miró Wall" (Miró-Wand in German). The mural is a work of art by the Spanish artist Joan Miró, with the collaboration of his long-time colleague, the ceramist, Joan Gardy Artigas, and is made of 7,200 ceramic tiles. It has been subject to degradation due to air pollution since it was installed in 1979.