Emperor qian long built the guanyin hall at minor western heaven for his mother to pray for her happiness and longevity . it is the largest palatial hall in the style of a square pavilion in china . a plaque with the characters " land of extreme happiness " in the handwriting of emperor qian long hangs from the ceiling 小西天又称极乐世界，是乾隆皇帝为其母孝圣皇太后祝寿祈福而修建的;观音殿为中国最大的方亭式宫殿，殿内藻井梁坊上悬“极乐世界”蓝底金字匾，字为乾隆皇帝御笔。
