Much medieval poetry is by Zen monks. These are poems designed to enlighten, like koan, or death
poems summarising the monk's life or thought, or at least creating a final statement. Much of
these are precursors of Haiku, which became very Zen in time. I'll quote one from Ikyu (also famous
as a calligrapher)(translation by Lucien Stryk):
After ten years in the red-light district,
How solitary a spell in the mountains.
I can see clouds a thousand miles away,
Hear ancient music in the pines.