 Spanner's designs utilized innovative manufacturing techniques such as curved plywood and non-upholstered, woven-web seating.Many of the designs reused components and shared consistent proportions, which gave his work a characteristic aesthetic.Among his three residential furniture lines (Ruspan Originals, Catalina, and Pasadena) the "Lounge Chair with Arms" has been described as the "best-known and most desirable" design.