And Zen Buddhist philosophy was into it. In handed-over haiku one might try to penetrate to some fundamental wisdom or axiom. The old and modern poem can seek to describe an aspect of natural things or eternity portrayed through nature symbols and images, as paired with human scenes. What happens when the different planes of references blend, fairly often calls forth much interest. Mysterious thinking may be handed over and good stuff from the castle of truth inside lies in many fair and common purposes.
Inner preparedness paves the way for more success linked to gentle perceptions.
And in Nara All the ancient Buddhas. There are deep meanings in the poem. It is not as brittle as it looks like in English translation either. Such poetry has earned him a reputation as the greatest Japanese haiku poet of Japan - he is also known for many travels through books he wrote of what he saw and took part in. He often strove for that.