The occasion was the 60th anniversary of the well known chair by Hans J. Wegner called Wishbone chair. Carl Hansen & Søn is the company which produces these famous Danish design chairs. Now in victorian times chair arches commemorated a royal visit or a special occasion, so why not create chair arches with the Wishbone chair commemorating its anniversary. It's done in print ads and in real at Milan Furniture Fair.
Chair arch in victorian times, and as art by The Glue Society.