easywhat am-i

The more you take away, the larger it becomes? What is it?
Common Wrong Answers
“A balloon”
A balloon gets smaller when air is taken out, rather than larger.
“A shadow”
A shadow does not necessarily get larger when something is taken away; it changes based on light and object position.
“A mountain”
Taking away material from a mountain (like mining) would reduce its size rather than increase it.