ALIGHIERO BOETTI (TORINO 1940 - ROMA 1994) ‘Cieli ad alta quota’ 1992 jigsaw puzzle, six elements 20.8 x 27.4 cm each ed. of 4000 ex., produced for Austrian Airlines in collaboration with Asea Brown Boveri on the occasion of the exhibition Cieli ad alta quota curated by Hans-Ulrich Obrist at the Museum in Progress in Vienna Literature G. Maffei, M. Picciau ‘’Alighiero Boetti. Beyond the book Beyond books‘’ Mantua, Maurizio Corraini Editore, p. 290 colour ill. (other illustrated copy)