What gets bigger every time you take from it?

Why this works

This riddle plays on the concept of subtraction and the nature of a hole. When you take material away from a solid surface to create or enlarge a hole, the hole itself increases in size. The word "bigger" cleverly refers not to something that is being filled or added to, but rather to the paradoxical idea that removing material makes the empty space larger! It's a fun twist on how we typically think about growth and size.