Make something up, give it a name, and you’ve created a concept. Teach your concept to others, and as long as they agree, you’ve created something real. How do we work this magic of creation? We categorize. We take things that exist in nature and impose new functions on them that go beyond their physical properties. Then we transmit these concepts to each other, wiring each other’s brains for the social world. This is the core of social reality.9
