21 January 1967 in Warsaw – Kantor organized his happening entitled “The Letter”. Seven postmen carried a letter which was 14 metres long and 2 metres high from the post office in Ordynacka Street to the Foksal Gallery. It is there that the members of the audience awaiting the letter are continually informed by four reporters about its current location, and it is there that the spectators begin the process of joint destruction, which unexpectedly unleashes waves of spontaneous aggression. It took one and a half hours. Participants: Z. Gostomski, E. Krasiński, W. Borowski, M. Tchorek, M. Stangret, H. Ptaszkowska, seven postmen, the audience and Tadeusz Kantor.