1969. Starting from this period, Gianni Colombo deepens the studies on the switching of patterns obtained with electronic generators, displayed on television kinescope and driven by voblers: Vobular signals (videotape). He attends the Konstruktive Kunst exhibition at the Kunsthalle in Nuremberg. He also realized the Zoom Squares environment, presenting at the Art actuel en Italie exhibition at the Palais des Beaux-Arts in Brussels and in Belgrade.
1970. He collaborates with Vincenzo Agnetti, with whom he realizes the environment Campo pratica at the Studio Marconi in Milan. In Montepulciano, for the exhibition Amore Mio, he realizes the Ingombri Estetici. Also in 1970, Gianni Colombo participated in the Vitality of the Negative exhibition in Rome, where he created a new variant of the contiguous Topoesthesia Zone. At the gallery La Città di Verona presents the environmental work Zoom Squares - Cromo(crono)dromo. At the Civic Museum of Bologna, on the occasion of the exhibition Behaviors, Projects, Mediations, curated by T. Trini and R. Barilli, exhibits the videobooks vobulati Signals, 1969.
http://www.kanalidarte.com/en/artisti/colombo_gianni_eng-34 (04. 05. 2019)