Hongzhi's Called Back from the Dream (MK34)

KOAN:

A monk asked Hongzhi, “What about the ones who’ve gone?”
Hongzhi said, “White clouds rise to the top of the valleys, blue peaks lean into the empty sky.”
The monk asked, “What about the ones who return?”
Hongzhi said, “Heads covered in white hair, they leave the cliffs and valleys. In the dead of night they descend through the clouds to the market stalls.”
“What about the ones who neither come nor go?”
“The stone woman calls them back from their dream of the world.” 

—PZI Miscellanous Koans, Case 34