Demon Trapped In Glass in Vienna, Austria. This small figure of a devil incorporated into a solid glass prism was originally in the collection of Archduke Leopold Wilhelm (1614- 1662); the 1659 inventory lists it as a small square glass, with a pointed top, that contains a black figure in the shape of a devil. By 1720 it was in the Treasury in Vienna and was described as a spiritus familiaris in a glass that was driven out of one possessed and banned to this glass. In the Middle Ages it was wide