ABSTRACT
Categorical principles guide people's thinking and help them classify ideas and observations. Even with a limit sample, it can be quite difficult to determine whether a phenomenon immediately adjacent to the limit is acceptable or not. The world contains billions of people and things, and as a result, relationships among those people and things must be nearly infinite. First, however, these relationships can be divided into two categories: related and unrelated. An object may be either concrete or abstract. A concrete object can be apprehended by means of one or more of the five senses: sight, touch, hearing, smell, and taste. Abstract objects, in contrast, are relationships — between concrete objects, between concrete and abstract objects, or between abstract objects. A technical worker is said to work on concrete objects, whereas someone in finance, for example, is said to work on abstract objects.
