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Three innocent-sounding children's stories Yun Tianming tells Cheng Xin across light-years — encoding curvature propulsion, the dual-vector foil, and the safe-haven of low lightspeed.
The fairy tales — 'The New Royal Painter,' 'The Glutton's Sea,' and 'Prince Deep Water' — are Yun Tianming's only chance to send strategic intelligence past Sophon's surveillance. Every image is a metaphor: the painter's brush that paints things flat is the dual-vector foil; the prince's soap-powered boat that outruns currents is curvature propulsion; the deep water that hides the kingdom from the eye in the sky is the slow-light black domain. The IDC takes a generation to decode them. AA cracks the boat metaphor first, in an afternoon, with dish soap and paper.
Transmitted as a fifteen-second holographic call from somewhere inside the Trisolaran fleet — Yun Tianming, looking thirty, in a plain dark coat, sitting in a featureless room. Then a long secondary text feed: three short fairy tales in archaic Mandarin, fully illustrated, with the texture of Brothers-Grimm-meets-Hans-Christian-Andersen. Total length under fifteen thousand words.