Lightly edited on January 31, 2022.

Yokohama, Japan Let me begin with a story:
A long time ago in China, King Xiang of Zhou proceeded to the Cloud Dream Pavilion accompanied by the poet Song Yu. Beholding the peak of Gaotang, they saw a single cloud billow and rise straight up, suddenly changing and shifting within a short time.
The king asked Song, “What kind of spirit is this?”
“That is called the morning cloud,” said Song.
“What is the morning could?”
Song explained: