" Her mother has been going on and on to them (well, to George, because Henry is on a computer game) about fresco structure, about how when some frescoes in a different Italian city were damaged in the 1960s in bad flooding and the authorities and restorers removed them to mend them as best they could, they found, underneath them, the underdrawing their artists had made for them, and sometimes the underdrawings were significantly different from their surfaces, which is something they’d never have discovered if there hadn’t been the damage in the first place. "

― Ali Smith , How to Be Both