This book, written as a study in applied Cultural-Historical (CI) psychology, is, in essence, one part of the Science of Thinking. The entire first section is taken from “Introduction to the Science of Thinking” and forms the theoretical basis of the study. The second part contains materials from a large seminar on the science of thinking, held at the Academy of Self-Knowledge in January 2008. The seminar was called “The Marriage of a Fool” and worked on material from Lyubzha.