US balance toy dating from the 1930s/1940s, made of coloured wood and metal. Sweet is a horse with a young cowboy riding it. It defies the laws of gravity by standing on its rear legs. The trick behind the balancing horse is not hidden at all and consists in a metal weight placed with a long rod under the horse's belly to lower the centre of gravity. This way it creates a perfectly stable balance so that the horse and cowboy rock gently as the name suggests. For decades it has been enchanting young children who think that it's magic as well as adults who try to remember the concepts of physics, mechanics, forces, gravity, balance, centre of gravity and centre of mass they learned back in school.