Great spotting by Paul Lundgren and Susie LeGarde Menz in Perfect Duluth Day Blog (link HERE) of a 1965 ad for the opera performance of (I think) La Traviata, held in the Duluth Denfeld Auditorium. This artistic rendering (below)–including the architectural beauty of the Denfeld auditorium–was featured in a Time Magazine advertisement for Northern Natural Gas Co., now Enbridge. They featured the (then) Duluth Symphony Orchestra performances in their advertising campaign. This ad made quite a hit in Duluth when it came out, with national focus on our local community arts. I discovered that you can purchase this lovely art poster for $9.95 through E-Bay natural gas collectables (HERE).