Lutheran churches in Germany possess an unparalleled wealth of medieval art works. Other than is generally believed, Lutherans treated medieval church interiors relatively mildly, maintaining or altering the use of many elements or simply by tolerating them as 'middle things' ('Mitteldinge'). This effect, that has only recently begun to gain wider recognition, has been termed the "preserving power of Lutheranism". As a consequence, it is the interiors...