Abstraction is a Necessity for Communication

The English words "man," "fish," "star," "Hower," ·run," "grow," all denote classes of objects or events which may be recognized as members of their class by very simple attributes, abstracted from the total complexity of the things themselves.

Abstraction is thus almost a necessity for communication, since it enables us to represent our experiences with simple and rapidly made "grasps" of the mind. When we say that we can think only of one thing at a time, this is like saying that the Pacific Ocean cannot be swallowed at a gulp. It has to be taken in a cup, and downed bit by bit. Abstractions and conventional signs are like the cup; they reduce experience to units simple enough to be comprehended one at a time. In a similar way, curves are measured by reducing them to a sequence of tiny straight lines, or by thinking of them in terms of the squares which they cross when plotted on graph paper.