"(head|) in the clouds" 的定义和意义

What is the origin of the idiom "in the clouds" and when to use it?

The exact origin of the phrase "in the clouds" is unclear. However, it is believed to have originated from the visual imagery of someone whose thoughts or attention seemed to be wandering or floating away like clouds in the sky. The phrase has been in use for quite some time and has become a common expression in the English language. It effectively captures the idea of someone being mentally detached or lost in their own thoughts.