Tino Sehgal

Even though no material relic of Sehgal's work remains after its presentation, in 2008 the Museum of Modern Art acquired his work "Kiss" for $70,000. In accordance with the artist's purist principles, the purchase (completed with an oral agreement and handshake) entails only the right to reproduce the work. No tangible document changed hands.
For those who need a bit of background on why the artist eschews conventional art objects: A student of economics and former dancer and choreographer, Sehgal maintains that the developed world has too much stuff. His favored means of creating art does not diminish Earth's dwindling resources or contribute to the excess of consumer goods. His art exists only transiently and leaves no physical trace. Like Brigadoon blossoming one day each century, Sehgal's art lives during the experience and afterward persists in memory and legend.