Discuss the differences between art that exhibits realism versus idealism, then between realism and abstract.
Realism is a representation of what the world seems to be in the eyes of the artist at that time.
Idealism is a representation of what the world could be or what the artist thinks it could be in another time. Realism is true to what is seen. Abstract takes that object and distorts them or uses shapes to represent them. Photography is true. When you look at a photograph it is the true representation of that picture.