Yves Klein
[Artist, b. 1928, Nice, France, d. 1962, Paris.]
In regard to my attempt at the immaterial… it is impossible to give you a photograph. (On refusing to allow photographic documentation of the “Zones of Immaterial Pictorial Sensibility,” significant early conceptual art pieces; 1959-1962. Collectors purchased gold bars, threw them into the Seine under the artist’s supervision, and then burned the associated receipts and paperwork. The ultimate art is a memory of the experience.) 
