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.”