Possible interpretations:
* Literal: Maybe you're thinking of a physical object like a book, where the head is the content and the cover surrounds it.
* Figurative: The "head" could represent a person's thoughts, emotions, or ideas, and the "cover" could symbolize something that masks or hides them.
Possible answers:
* A book: The most literal interpretation, the cover physically surrounds the pages containing the text.
* A hat: A hat covers the head literally.
* A mask: A mask hides the face, representing a cover for someone's true identity.
* A secret: A secret is something kept hidden, like a cover surrounding a thought.
* A disguise: A disguise hides someone's true appearance, acting as a cover.
Do you have any other clues to help narrow it down?