The central claim of the book is that property is a universal and uniquely human custom. Contra cultural relativists, every human society has property tools, utensils, and ornaments. Contra biologists, only Homo sapiens has property in things other than food, mates, and territories. Contra philosophers and legal scholars, the bedrock of property is custom, not rights. Contra social scientists and ordinary people, property is indeed a custom and not something that must be instituted by government. Property operates at the three levels. At the micro-level core of property is an organism that perceives the physical world through its body. The meso-level of property is the community within which the organism resides. At the macro-level of property are the institutions that unite strangers of different communities through the modern democratic concept of rights. Whereas the custom of property is ancient, moral, and universal to all people, property rights are modern, amoral, and majoritarian.