According to the legend of Bonism, a local religion in Tibet, there are thirteen floors in the sky, and the ladder connects heaven and earth.
Nie Chizampu is the first Tibetan king in Tibetan historical legends. He and the six Tibetan kings after him were known as the "Seven Kings of Heaven and Red" in history. Legend has it that the seven kings of Tianchi are all immortals in the sky and will ascend to heaven after death.
Tibetans in the Ministry of Industry believe that people can climb to heaven through the "ladder" painted on nearby cliffs after death, so many cliffs in the Ministry of Industry are painted with such "ladders".
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"Wang Tong's Family History" records: "The body of the gods has no remains, and it disappears like a rainbow" (rainbow). The rainbow is a rope to climb the sky and the mountain is a ladder, so there is no grave in Tibet.
It is said that the Tibetan king Zhigongzanpu cut off his rope to ascend to heaven in a duel after the Seven Kings of Tianchi due to negligence. Since then, the Tibetan king has remained on earth because he can't ascend to heaven after his death.
People built the first Tombs of Tibetan Kings for him in Qingwadazi, and the ladder symbols painted on it became the gateway to heaven.
Baidu encyclopedia-ladder theory