… the relation of a repraesentamen to its object (correlate) may be a real relation and, then, either an agreement or a difference, or it may be an ideal r[elati]on or one from which the reference to a correspondent (subject of representation) cannot be prescinded by position. In the first case, that is where the repraesentamen has a real agreement with its object, the representation consists in a likeness; a simple quality of the object is shown but the object itself is not said to exist.