Dedication, signature and year at the back. The work was created between 1969 and 1973 by Enrico Baj who, with some of the most important artists of the 1970s, joined the group known as "Polimero Arte". On this occasion, they worked with the plastic material production factory, Mazzucchelli Celluloide in Castiglione Olona, ​​experimenting with the unusual processing of plastic as a new means of creative expression. In June 2004, the MAP Plastic Art Museum was inaugurated in the historic Palazzo dei Castiglioni in Monteruzzo. Defects