What is the origin of the idiom "walk on air" and when to use it?

The origin of the phrase "walk on air" can be traced back to ancient Greek mythology. In Greek mythology, Hermes, the messenger of the gods, was often depicted with winged sandals that allowed him to fly and move swiftly. This representation gave rise to the idea of "walking on air" as a metaphor for experiencing a feeling of lightness and euphoria. This idiom is used in informal conversations, storytelling, and expressions of enthusiasm.