Daniel was using the sole of one boot to sweep loose dirt away from a hard surface he'd sensed underneath. Wee polygons – terra-cotta, indigo, bone-white, beige – appeared. He was looking at a snatch of a mosaic floor. He swept away more dirt and recognized it as a rendering of a naked leg, knee flexed and toe pointed as if its owner were on the run. A pair of wings sprouted from the ankle. 'Yes, the Roman floor we'll keep,' said Mr. Ham, 'as we need a barrier – to discourage clever men with shovels. Jonas, where are the loose bits?'