sentences:  In "Das Buch vom Kitsch" ("The Book of Kitsch"), Hans Reimann defines it as a professional expression "born in a painter's studio".The study of kitsch was done almost exclusively in German until the 1970s, with Walter Benjamin being an important scholar in the field.Kitsch is regarded as a modern phenomenon, coinciding with social changes in recent centuries such as the Industrial Revolution, urbanization, mass production, modern materials and media such as plastics, radio and television, the rise of the middle class and public educationall of which have factored into a perception of oversaturation of art produced for the popular taste.