Do you know why "Cloud Hands" is a marvelous pattern in Taijiquan?

Where did the patterns in "Grasping Sparrow's Tail" come from? They came from "Cloud Hands". Initially "Cloud Hands" did not have any fixed forms. In his chi flow, Zhang San Feng moved about gracefully, and these movements were poetically described as "flowing water floating cloud hands", later shortened to "Cloud Hands". "Cloud Hands" is a marvelous pattern. Do you know why?