easywhat am-i

What is higher without the head, than with it?
Common Wrong Answers
“A mountain”
A mountain is not higher without its peak; it maintains its height regardless of any weight placed upon it.
“A roof”
A roof does not change its height based on whether something is on top of it; it remains constant.
“A flagpole”
A flagpole's height remains the same regardless of whether a flag is at the top, making it not applicable to the riddle.