I read that lyric today in a poem, Mirage at Sea (1085) by Su Tung-po, and it made me visualize undulations of creation
with all life forms flowing out of the undulations into this earthly,
this universal, existence.
And It seemed to me that undulations was the perfect word
for all the created forms, known and unknown, sentient and
insentient, arising on the earth and in the universe
every second of every day.
Bob Boyd