The functioning of the art world is dependent on art institutions, ranging from major museums to private galleries, non-profit spaces, art schools and publishers, and the practices of individual artists, curators, writers, collectors, and philanthropists. A major division in the art world is between the for-profit and non-profit sectors, although in recent years the boundaries between for-profit private and non-profit public institutions have become increasingly blurred. Most well-known contemporary art is exhibited by professional artists at commercial contemporary art galleries, by private collectors, art auctions, corporations, publicly funded arts organizations, contemporary art museums or by artists themselves in artist-run spaces. Contemporary artists are supported by grants, awards, and prizes as well as by direct sales of their work. Career artists train at art school or emerge from other fields.