Everything exists according to its own nature. Our individual perceptions of worth, correctness, beauty, size, and value exist inside our heads, not outside them.
On the leafless branch
Perched a crow:
An autumn eve.
Another timeless moment for us to savor and incorporate into our very nerve cells.
All creatures! They squirm about among The flowers in bloom.
Flowers bloom calmly. Human beings squirm restlessly. Well-they bloom; we squirm. That's all, Issa says.
Quietly and serenely
He gazes at the mountains.
Issa is actually having a little fun at the expense of a frog and of a presumably somewhat overly "mystical" Chinese poet. And at our expense—if we take our sitting quietly too seriously. Squirming is part of our nature, too.