This card was purchased from a private collector who purchased it from the Van Eelen’s (important Dutch collectors). The card was sent from Torino in Italy to the Van Eelen’s in June of 1970 (see postmark). Lewitt was in Torino then to install Wall Drawing 51 which was first installed in 1970 in  the Museo di Torino and the Sperone Gallery.

Beginning in the mid-1960s Sol LeWitt (1928– 2007) transformed the process of art-making by questioning the basic relationship between an idea, the subjectivity of the artist, and the artwork a given idea might produce. LeWitt's use of the square was driven by the idea that it is the 'least emotive' of forms, highlighting the importance of the idea over the artist's hand or 'mark'.