During the 1950s,60s and 70s, Danish painter and illustrator Otto Nielsen produced a treasury of marvelous illustrations for periodicals, books, travel guides and advertising posters. He is well known for his wonderful posters for Tivoli Gardens in Copenhagen, but some of his best work was done for Scandinavian Airlines System. One of Nielsen’s finest series for SAS was based on animals found at the airline’s destination countries. I recently ran across a few for sale.