Envoys to Mongke’s court at Karakorum reported the working of an unusual contraption in his palace. A large tree sculpted of silver and other precious metals rose up from the middle of his courtyard and loomed over his palace, with the branches of the tree extending into the building and along the rafters. Silver fruit hung from the limbs, and it had four golden serpents braided around the trunk. At the top of the tree, rose a triumphant angel, also cast in silver, holding a trumpet at his side. An intricate series of pneumatic tubes inside the tree allowed unseen servants to blow into them
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