As a philosophy, naturalism is the belief that there are only natural (not supernatural) forces operating in the universe. Ideas such as the existence of a consciousness or a soul could only be explained through natural sciences. Naturalism assumes that humans have little or no control over what happens to them. They are unable to exercise free will to affect their situations and have little control over what happens. Individuals are at the mercy of external and internal forces which control their destinies. Naturalistic works tend to see humans as the products of biological and/or socio-economic determinism. Like the realists, naturalists claim to present their subjects objectively with no comment on the morality or the fairness of what happens to the individual characters.