A monument is frequently a three-dimensional piece of art, thus a sculpture, that is used to commemorate or memorialize an event, a location, or a person. A monument is generally huge and open to the public. A monument, on the other hand, does not have to be a work of art. It might be a structure or a natural thing. However, it must serve to honor or to memorialize someone or something. Public art includes sculptures, paintings, and other works of art that are installed in public spaces -- such as parks, squares, and buildings -- without any connection to individuals or events. Public art is meant to be accessible to the general public, and people are often invited to contribute ideas for new pieces of art. Monuments usually carry the name of their subject while public art tends to be more generic. For example, a monument to John F. Kennedy in Washington, D.C., would be called "The President's Cup." But a sculpture of a man walking through a city park with a newspaper under his arm is called "The Low-Down Line." Public art can also include objects that do not fall under the category of sculpture but instead take the form of drawings, models, or installations. For example, a map showing war zones around the world could be considered public art because it is presented to the public even if no individual face or name is associated with it. There is also music art that is included in this category.