Because of the way it descends its thread, a spider signified "happiness descending from heaven" or, to the imperial concubines, a nocturnal visitation from the emperor.
蜘蛛下垂的樣子，寓意「喜從天降」，被宮中嬪妃視為當夜能獲得皇帝寵幸的彩頭，稱為「喜子」。