Issa wrote:
The one-foot waterfall
Also makes sounds;
The evening cool.
This is Issa’s version of “The morning glory that lives but a day differs not at heart from the giant pine that lives for a thousand years.” A one-foot waterfall, like a greater waterfall, also has the pleasant, soothing and cooling “sound of water.”
Like many of Issa’s hokku, this example is subjective; it adds “thinking,” seen in the word “also.”
HOKKU 
I enjoy getting in the creek and walking upstream in the water, when the water is not too high. I walk very slowly, observing everything in the creek and on the banks. One of my favorite sounds, in nature, is the one foot waterfall Issa speaks of. It adds so much to the walking meditation…my creek walks.