Philosophy
The Metaphysics of Holes and the Problem of Spatial Boundaries
Quick fact
Some philosophers have argued that a hole is not a physical object at all, but rather a 'negative entity'—a region of space defined by the material that surrounds it, which challenges our standard assumptions about spatial boundaries.
Why this is interesting
Holes are everywhere—in donuts, cheese, and fabric—but are they actually part of the furniture of reality? Could a hole be said to exist in the same way a donut does?