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The three powers are heaven, earth and humanity. The Yizhuan says the way of heaven is yin and yang, the way of earth is soft and firm, the way of humanity is benevolence and righteousness. Three layers of meaning pressed onto one plaque, usually heaven above, earth below, and a human figure or a talisman in between. The idea of the three powers predates Daoism and was borrowed later by talismanic practice. A tall plaque suits three registers, one above the other, and a horizontal line between them keeps the layers legible.
The Celestial Master is Zhang Daoling, with whom the Way of the Celestial Masters begins. The title passed down through the generations, and Mount Longhu became the ancestral seat. That is the history of a religion, and it has nothing to do with a copper pendant. Images usually show him holding a sword or a seal, in Daoist robe and crown, with a thin face. The seal commonly shown carries the Yangping zhidu gong inscription, the ritual seal handed down in the Celestial Master’s residence.
Silver and gold versions differ in surface treatment. The silver is cold, the lettering deep, the look crisp; the gold is warm and, once aged, resembles an old brass lock and sits quietly against dark clothing. Both are cupronickel underneath, so the colour is a surface and not a different metal. Worn long enough, the gold shows white on the edges, which is a property of the process rather than a defect. Put the two side by side when choosing, and look at them once under a lamp and once in daylight by the door.
A long plaque hangs vertically, and a chain to the chest is enough. The body is narrow, so it seldom turns, and it does not knock against clothing as you walk. Check the small hole at the top regularly: copper wears thin from the mouth of that hole first, and once it has stretched, change the cord. A Chopin chain or a leather cord is steadier than a fine cable chain. Under a turtleneck in winter it presses a mark, and a layer of cloth fixes that. The plaque is not light, so a thin neck should shorten the chain and reduce the swing.
"Talisman" is a folk word, not a promise. For a gift, "a bit of reassurance" is safer than any claim about efficacy. Someone may compare it with a talisman obtained at a Daoist temple; that is a different thing, and saying so costs no sale. If the plaque carries the Celestial Master’s portrait, the history of Zhang Daoling is more useful than talk of power. Anyone who truly believes will go to a temple; most people in the shop are looking at the work. Some are both, which is easier still.