La "Dualidad," escultura prehispánica o del siglo xx?

An essay is presented that discusses the authenticity of the sculpture "Dualidad," considering if it is an example of pre-Hispanic art or a forgery. The sculpture, which is on exhibit in an anthropology museum, depicts human head, each half representing different characteristics of a person. In order to determine its origins, this article discusses documents referring to its discovery and also techniques used by the artist.