A Universal Mistake One of the most important of Ayn Rand's contributions to the field of epistemology is contained in the seventh chapter of her Introduction to Objectivist Epistemology entitled, "The Cognitive Role of Concepts." In it she explains how the world we are conscious of is comprised of an infinite complexity of existents, events, and relationships and why it is not possible for us to comprehend this complexity simply by perceiving it. To understand it, we must "break it up," into manageable pieces we can identify and understand. This, Ayn Rand explains, is the role of concepts."The essence...