 Ideas are said to be confused whenever they include or contain simple natures belonging to the two mutually exclusive classes of simple nature (the two classes together forming the enumeration). Here, the Latin confusio means mixed together. The adventitious idea of the Sun is an example of a confused idea. In presenting the Sun as circular-shaped and hot, the idea includes simple natures that belong to the two mutually exclusive classes. Shape belongs to the class whose members presuppose the simple nature extension, whereas heat (a quality) belongs to the class whose members presupposes the simple nature thought or thinking. An idea is said to be distinct, then, whenever it includes or contains only simple natures belonging to one of the mutually exclusive classes. The astronomical idea of the Sun, as introduced in the Third Meditation, looks to be an example of a distinct idea. It includes only those simple natures belonging to the class whose members presuppose the simple nature extension. (Smith 2010, 2015)