In 1959, Allan Kapprow, like John Cage, wished to place more responsibility on the observer. He sent invitations stating, "you will become a part of the happenings; you will simultaneously experience them." This paralleling the simultaneity of the Dada movement. Upon arrival to this mysterious event, "some guests received envelopes containing paper, photos, wood, and other media." There were three rooms in which events were to take place, including some acting. Chairs were placed facing each other, forcing a sort of dialogue. Each happening in each of the rooms was begin and end with the sounding of a bell, and each group would rotate from room to room with some direction. The performance piece was placed on the observers. Kaprow warned, "the actions will mean nothing clearly formulable so far as the artist is concerned." This early happening would influence future events of this nature.