Guerilla sculpture is the placement of sculptures in street settings without official approval; it developed from street art in England in the late 20th century.  In addition to the nontraditional setting of the works of art involved, there are also many different techniques used in the creation of this art work. The artists tend to work illegally and in secrecy to create and place these works in the dark of night, cloaked in mystery regarding their origins and creators. The sculptures are used to express the artist's views and to reach an audience that would not otherwise be reached through more traditional methods of displaying one's work to the public. In performing these acts of artistic expression, they are not working to gain acceptance or love of the people that they reach, but at times may even anger those who view their work.