Alighiero e Boetti

A famous example of his Arte Povera work is Lampada annuale (Yearly Lamp, 1966), a single, outsized light bulb in a mirror-lined wooden box, which randomly switches itself on for eleven seconds each year. This work, which is on display at the Tate modern, focuses both on the transformative powers of energy, and on the possibilities and limitations of chance – the likelihood of a viewer being present at the moment of illumination is remote.

http://yalebooks.wordpress.com/2012/03/05/mapping-alighiero-boettis-career-new-book-and-tate-exhibition-celebrates-the-italian-conceptual-artist/