What gets bigger the more you take away from it?

The curious characteristic of an empty space is that its dimensions increase as more material is extracted from its perimeter. Consider the act of digging into the ground; with every shovelful of soil removed, the cavity grows wider and deeper. This phenomenon occurs because the size of the void is defined by the absence of matter around it, meaning that expanding its boundaries directly correlates with the removal of the surrounding substance.

This principle is fundamental in various practical applications, from creating a simple planting hole in a garden to the monumental task of excavating for a new building's foundation (Review) or tunneling through rock. In construction and engineering, understanding how to manage and enlarge these absences is crucial. Each piece of earth, rock, or other material taken away directly contributes to the expansion of the empty space being created.

This riddle playfully challenges our typical understanding of how things change size. While most objects diminish when parts are taken away, an empty space, by its very nature, expands as its containing elements are removed. It serves as a clever reminder that our perception of size and volume can depend entirely on whether we are considering presence or absence.