• Down the winding cavern we groped our tedious way, till a void boundless as the nether sky appeared beneath us, and we held by the roots of trees and hung over this immensity; but I said: if you please we will commit ourselves to this void and see whether providence is here also.

    William Blake, W. H. Stevenson (2007). “Blake: The Complete Poems”, p.122, Pearson Education