June 5: first experiments with the "living brushes" technique in Robert Godet’s apartment on Ile Saint-Louis in Paris. A great friend of Yves Klein, with whom he shared a genuine intellectual complicity, Robert Godet was a disciple of Gürdjieff, a judo instructor and occult philosopher. In the course of the evening, Yves covered in blue paint the naked body of a young woman, who, through a series of rotating movements, left her bodily prints on a sheet of paper set on the floor, until the support was fully saturated. The result was a blue monochrome.