This quote means that any original work of art should be seen as a discussion or debate between the artist (person who created the art) and the people who experience it or view it (the audience). The artist is expressing their ideas, feelings, and beliefs through their artwork and the audience is reacting to it, forming their own ideas and interpretations. The artist and their audience are entering into a dialogue, debating what the art means, allowing both parties to express their thoughts and feelings more fully.