Sanxingdui, an ancient Shu civilization site that suddenly emerged on the Sichuan Plain, is like a time-traveling cipher box. Bronze sacred trees pierce the vault of heaven, vertical-eyed masks gaze into the unknown, and golden scepters hold hidden mysteries of royal power — these artifacts, transcending the imagination of their era, are neither recorded in historical documents nor aligned with any known civilization trajectory. They seem as if a gift from an extraterrestrial civilization, or a concrete manifestation of ancient ancestors' wild fantasies about the universe. Three thousand years ago, craftsmen, with their bizarre and intricate designs, sealed an unknown theocratic world beneath the loess, leaving only endless questions: Who were they? Why did they create these? And where did they go?