Ducks flying up the wall" refers to the popular decorative item of wall-mounted flying ducks, which originated with Beswick ceramics in the 1930s and later saw a resurgence in popularity due to television shows like Hilda Ogden's wall mural in the UK and general retro trends. These ornaments, often in sets of three and sometimes called "three plaster ducks on the wall," are still sold today in various materials like ceramic, wood, and metal, and can be valuable collectors' items. 

The ducks pictured here are cast iron