The work is part of the controversial Panza Collection. “In the mid-‘70s Panza acquired from Judd a paper ‘certificate’ for an unconstructed work known as Untitled [Seven plywood boxes: open back] (1972–73). That document contained a rough sketch and dimensions for instantiating the work — a series of large, open, plywood cubes. When Panza later had the work made in Milan in 1976, based on the certificate and other more detailed instructional papers, Judd raised concerns.” – Hyperallergic