Yunmen's Japanese name, Ummon, was the namesake for a character which was featured prominently in Dan Simmons' acclaimed Hyperion Cantos science fiction series; Simmon's Ummon was a vastly advanced, intelligent AI from the "TechnoCore", who reveals key plot elements to the main characters, through koans and mondo (dialogue).
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During a subsequent visit to the tomb of the Sixth Patriarch in Guangdong, Yunmen ended up joining (c. 911 CE) the monastery of Rumin Chanshi/Ling-shu Ju-min, who died in 918 CE.
Five of the koans in the work concern the sayings and doings of Zhaozhou; four concern Ummon.