Jenny Holzer (born 1950) is an American conceptual artist.(…) The main focus of her work is the use of words and ideas in public space. Originally utilizing street posters, LED signs became her most visible medium, though her diverse practice incorporates a wide array of media including bronze plaques, painted signs, stone benches and footstools, stickers, T-shirts, condoms, paintings, photographs, sound, video, light projection and the Internet.
source: Wikipedia
http://www.jennyholzer.com/
Tags: projection, public art, public space