On 8 May 1733, when the master builder Johan Gråberg went to inspect the quarry of Wamlingebo (now Vamlingbo) in Sweden, two of the quarrymen came running up from the excavation in a most excited state. While cutting large blocks of sandstone more than 10ft (3m) below the surface, one of them had discovered a large frog sitting in the middle of a sizeable boulder he had just cut in two with his hammer and wedge. Gråberg followed the workmen down into the quarry, where he too was startled by the sight of the frog sitting inside the boulder. Part of the stone nearest the frog was so porous that the violence of the blow had fragmented it, destroying the impression of the animal’s body.