John Cage. 4'33" (In Proportional Notation). 1952/53. Ink on paper, each page: 11 x 8 1/2" (27.9 x 21.6 cm). About this work Cage said in a letter to his friend Helen Wolff : “The piece is not actually silent (there will never be silence until death comes which never comes); it is full of sound, but sounds which I did not think of beforehand, which I hear for the first time the same time others hear. What we hear is determined by our own emptiness, our own receptivity… "