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In Han dynasty (206 B.C.-220) secular Taoism philosophers became very technical and emphasis on technical skills and mathematical calculation. The technical methods of studying houses and tombs grounds has allowed the Taoism to revive after the huge persecution in the early Han Dynasty. It has become the most fashionable study for well to do Chinese scholars who had too much time, money and wisdom. They also pushed the application of Taoism and I-Ching to the every day practice to furniture arrangements.