Philosophy
Ontological Dependence and the Grounds of Reality
Quick fact
In metaphysics, 'grounding' is often called the 'in virtue of' relation: a truth is grounded in another if the first holds because of the second. For example, the whole is grounded in its parts.
Why this is interesting
A chair exists, and so do the molecules that make it up. But does the chair depend on the molecules, or could the chair exist even if the molecules did not? This puzzle reveals a deep structure behind everyday existence.