Signature bottom right. On the reverse: signature and date.
Bibliography: 1989, The praise of the threshold, Carla Accardi, G. B. Salerno, in "Tema Celeste" January - March, n. 19, Syracuse, p. 50; 1999, Accardi Monograph Reasoned, G. Celant, ed. Zerynthia Charta, Milan, 1988 5.