Upon experiencing Self-realisation Wumen wrote the following enlightenment poem:
A thunderclap under the clear blue skyAll beings on earth open their eyes;Everything under heaven bows together;Mount Sumeru leaps up and dances.
Mount Sumeru is the central world mountain in Buddhism. This central axis is reflected in a human being as the Shushumna channel in the spine. The Kundalini energy leaps up the spine and dances on the crown of the head during Self-realisation.