Fluid Concepts and Creative Analogies

Fluid Concepts and Creative Analogies: Computer Models of the Fundamental Mechanisms of Thought (1995) is a book by Douglas Hofstadter and the Fluid Analogies Research Group that presents a collection of computer programs designed to model high-level cognition through the mechanism of analogy-making. The central thesis — developed across projects including Copycat, Letter Spirit, and Tabletop — is that analogy is not a peripheral cognitive skill but the core operation by which humans perceive, categorize, learn, and create. Every mental act, Hofstadter argues, is a form of analogy: the mind maps the present onto the past, and the fluidity of that mapping determines the richness of thought.

The programs in the collection deliberately avoid the scale and statistical methods that would later dominate machine learning, instead pursuing what Hofstadter calls careful