In philosophy, realism is a term with two main technical uses. Philosophers who believe, as Plato did, that universals exist in their own right, and so independently of perceived objects, are traditionally labeled "realists." Realism in this sense is opposed to nominalism. On the other hand, realism also describes the view that perceived objects exist independently of our perceptions of them. Realism in this sense is opposed to the extreme empiricism of such as Berkeley and Hume.