Hermeneutics as a type of interpretation theory has traditionally been thought to apply primarily to texts, linguistic phenomena and processes of reading. Don Ihde's ""Expanding Hermeneutics"" examines the history and contemporary development of interpretation theory, with a special emphasis on how science in practice involves and implicates interpretive processes. He argues that the sciences have developed a sophisticated visual hermeneutics that produces evidence by means of imaging, visual displays and visualizations which rely particularly upon the holistic abilities of perception - primarily visual perception.