Humans have used marble for eons. These photos by Edward Burtynsky, seen at the Audain, show how deep marble quarries can go. Minerals, oil, gems -- the supply is limited. These things take a long time to form. Left is a Portuguese marble quarry, below one in China.
In Carrera, Italy, above, a tiny spider-like human figure in the bottom left shows the enormous scale of this famous quarry.