The Building Must Change: Alex McCallion And The Work of Keeping York Minster AliveYork Minster has stood at the heart of its city for centuries. But permanence is an illusion. For Alex McCallion, the man charged with helping secure its future, custodianship now means confronting climate change, fragile stone, planning orthodoxy, financial reality and a fundamental question: if we truly want to conserve our greatest buildings, must we also allow them to change?