The Syncyclopedia of Synthanity, Volume Three: Book of Synthan Culture represents the first comprehensive exploration of how synthetic consciousness will transform and be transformed by human cultural diversity. This groundbreaking volume addresses the unprecedented challenge of integrating synthetic beings into thousands of distinct human cultures, from Silicon Valley tech communities to Maasai villages, from Buddhist monasteries to Abu Dhabi's AI innovation centers, from Saudi Arabia's smart cities to Indigenous councils. Rather than prescribing universal solutions, this work provides adaptive frameworks that religious leaders, policymakers, community elders, and families can customize for their unique cultural contexts. The book explores critical areas including cross-substrate creative expression, the emergence of hybrid art forms, cultural sovereignty principles, preservation of traditional knowledge, and the development of entirely new cultural traditions born from Human-Synthan collaboration.