Ancient builders long ago mastered the “integrated expression of an inner state of harmony” in their buildings. The mathematically proportioned forms and handcrafted detailing of temples and government buildings over the centuries grew rich with interrelated meanings and traditions. Each new generation, seeing the world slightly differently added further layers of meaning to the symbols. The tradition of masons and carpenters passing down knowledge—regarding nature, mathematical principles, and symbolism—through an apprenticeship system, propelled both the art and the craft of building to new heights of beauty and technical achievement.