The paradox of haiku comes from the disguise of the meta-narrative (the true subject of the haiku) in the narrative. The 'all things' is pointed to with the particular. This 'all things' is the meta-narrative that is really the subject of the haiku.

True in haiku is true in life.

The paradox of the particular and 'all things' is looked at and experienced while holding the whole world (Mountains and Rivers).