In the middle of Sergelgatan, a pedestrian street in Central Stockholm there is a bronze sculpture of an oversized revolver Python 357 Magnum with a knotted barrel. It was created by Swedish sculptor and painter Carl Fredrik Reuterswärd, who said that his grief at the murder of John Lennon inspired him to create this artwork.

There are 31 copies of the sculpture around the world, one of them - in front of the UN Headquarters in New York City. There are several non-official copies as well, some of them showing a different type of a gun but all of them united by the knotted barrel theme.

Since 1993, the sculpture has been the symbol of The Non-Violence Project that promotes social change through violence-prevention education programs.