Prologue : the promise of a meaningful image -- Representation, resemblance and religion -- The icon and the idol -- Iconoclasm, iconophobia and Islam -- Idols, icons and images in Islam -- Beauty, goodness, and wonder -- Alchemy, appearance and essence -- Dreams, visions and the imagination -- Sufism and the metaphysics of resemblance -- Words, pictures and signs -- Legibility, iconicity and monumental writing.