A summer shower;
The exhausted horse
Comes back to life.
I always see the muscles of the fatigued horse begin twitching with life shortly after the first drops of cool rain strike it.
We feel the sudden energy of the falling summer rain in the sudden renewed energy of the horse — activity in the rain, activity in the horse, so superficially one might think this verse exhibits harmony of “likeness.” Well, superficially, it does.
However, there is something more to it. Things exposed to a Yin environment over time tend to be Yang in nature; things exposed to a Yang environment over time tend to be Yin in nature.
Take, for example, the climate of Hawai’i, which is very warm, very Yang. The fruits that grow there are very Yin, very sweet and cooling. And people who live in a very Yang environment over countless centuries, such as Africa or the South Pacific, tend to develop “Yin”- colored skin, that is, dark skin, while those people who live in a very “Yin” environment such as Norway or Ireland tend to develop “Yang” -colored skin — that is, light skin (dark is Yin, light is Yang)
The best quality ginseng — a tonic root that is very “Yang” in herbal medicine — grows in the coldest mountains of North Korea, a very “Yin” environment.
How does all of that apply to Kitō’s verse? Well, the horse is exhausted by the Yang heat of summer and activity. The Yin rain refreshes the creature, and as a consequence he returns to his Yang, energetic state. So we can see that though the initial appearance of this verse is one of harmony of similarity, it is really showing us harmony of difference as the Yin rain brings about a Yang reaction in the horse.
We also learn from this that Yin and Yang are not absolutes; they are always working in relation to one another, always causing changing states and effects in their countless interactions.