Jenny Holzer (b.1950) is one of the most significant artists to work in the public realm since the 1980s. Starting on the streets of New York with simple fly-posters, she has gone on to disseminate her truisms, slogans, memorials and poems through a variety of media. They are enunciated by an unstable register of personae, be it ad-man, stand-up comedian, torturer, victim or evangelist. The sites for her work range from T-shirts and golf balls to...