Throughout his career, according to him, Yves Klein was "in search of the real value of the painting". The term "value" here suggests not only the colour nuance - the famous I.K.B. blue - or the artistic merit of the work, but also the commercial value, the exchange price. From exhibition to exhibition, from speculative discourse to artistic innovation, his career has been punctuated by the ceaseless quest for the 'right price' - the price that would do justice to the artistic merit of the...