The article discusses how our brain processes information through perceptual symbols, which are representations of sensory experiences. These symbols are stored in memory and can be combined to create complex simulations of different experiences. This process helps us categorize information, make inferences, and understand abstract concepts. By using perceptual symbols, our brain can create a fully functional conceptual system without relying on abstract symbols. This approach has implications for various fields like cognition, neuroscience, evolution, development, and artificial intelligence.