Developed by Marshall McLuhan and his son Eric in the ‘70s, the Laws of the Media represent McLuhan’s attempt to create a series of scientific statements about media. Also known as the Tetrads, the Laws of the Media are made up of four testable statements about the effect of any media or technology developed by man. McLuhan explored these ideas in several essays and in a book: Marshall McLuhan with Eric McLuhan. Laws of Media: The New Science . Toronto: University of Toronto Press, 1988.