The Mutable Glass: Mirror-Imagery in Titles and Texts of the Middle Ages and English RenaissanceThis 1982 book was the first major and comprehensive survey of mirror imagery to be found in medieval book titles and English literature from the thirteenth to the end of the seventeenth century. Working within the tradition of the historical study of metaphor as developed by E. R. Curtius, Professor Grabes not only traces the shifting historical usages of the mirror (as the metaphor's 'vehicle') but also studies the metaphor's structural function in