I am the hole in the night, the ever watchful eye. I return in a cycle, to enlighten the sky.

Why this works

This riddle cleverly describes the moon using vivid imagery and double meanings. The "hole in the night" refers to the moon shining brightly against the darkness of the night sky, almost like a hole that lets light through. The "ever watchful eye" signifies how the moon appears to observe us from above. The phrase "return in a cycle" hints at the moon's phases, which change regularly, illuminating the sky in varying degrees. Together, these clues encapsulate the moon's role in our night-time landscape.