The sound of hammers and chisels striking stone rings out on most Sundays in the cemetery of ancient Xochiaca, a village swallowed up decades ago by the urban sprawl of Mexico City. It's the sound of the stone carvers of Chimalhuacan — as the borough is known — who still pursue a craft passed down for generations, even after the local source of quarry stone was exhausted. The village cemetery is filled with yard-high (meter-high) statues of saints and a knot of men who coax flower garlands and flowers out of the blocks of stone with their chisels.