[1970s] Mario Merz, Fibonacci 1202, two artists’ books (1) Mario Merz, Fibonacci 1202 Mario Merz 1970. Torino, Sperone Editore, 1970. Boards with original printed dustjacket, 16.4 x 9.8 cm, 110 pp. with facsimiles of handwritten texts and sketches. Edited by Germano Celant and Pierluigi Pero. The drawings in the book refer to the Fibonacci sequence, in which each number is equal to the sum of the two numbers that precede it. Light soiling and irregularities to dust-jacket, interior in very good cond. with intact binding. (2) Fibonacci 1202 Mario Merz 1972. Torino, Galleria Sperone, 1972. Staple bound, 12.5 x 17.5 cm, 32 pp. Subtitled 'A real sum is a sum of people'. Features 11 b/w photo spreads by Mussat Pellion (Paolo Mussat Sartor and Paolo Pellion) of a restaurant room filling up with an increasing number of characters, reproducing a Fibonacci numerical sequence. Text in Italian and English. From the unnumbered edition of 1200 copies (with 55 signed and numbered). Striking booklet, light toning on cover, date in pen on verso of front cover, otherwise very good cond. (total 2)