The phrase is a metaphoric reference to the buddhist paradies . the dharma - raja s cave chogyal dupup and several other apartments dating back from the reign of the tu - b dynasty 629 - 846 are the earliest potala structures extant 法王洞曲吉竹普等部分建筑是吐蕃时期遗存的布达拉宫最早的建筑物，内有极为珍贵的松赞干布文成公主尺尊公主和禄东赞等人的塑像。
