This photo shows us one of some forty craters forming the Phlegraean Fields, a highly active volcanic region to the west of Naples. The Solfatara, a crater in the township of Pozzuoli, is known for the fumarole phenomenon. Giorgio Sommer captured the jets of steam and fumes after the manner of a nature study. Seemingly guided by an almost scientific interest, he framed the scene in such a way as to bring out the rough surface consistency of the geological formation. The fugacity of the volcanic vapours forms a suspenseful contrast to the enduring substance of the stone.