The monochrome - a single-colour work of art - is highly ambiguous. For some it epitomizes purity, and is art reduced to its essence. For others it is just a stunt, the emperor's new clothes. Why are monochromes so admired, yet such an easy target of scorn? In this illuminating book Simon Morley unpacks the meanings of the monochrome as it developed internationally over the twentieth century to today. In doing so he explores more general questions such as how artists have understood what they make, how critics variously interpret it and how art is encountered by viewers.