The mass production of printed materials shaped the culture of Western Europe from 1500 to 1900. Similarly electric modes of communication reshape civilization in the 20th century. Electricity does not centralise, but decentralises. The form of medium shapes its content. Any hot medium allows of less participating than a cool one, as a lecture makes for less participation than a seminar, and a book for less than a dialogue.
Cooler media exhibit lower levels of information intensity.
Had TV occurred on a large scale during Hitler's reign he would have vanished quickly. However, cinema is hot - the activity of film viewing, isolation and passivity, has similarities to the book reading. It is relevant to consider, that the old prints and woodcuts, like the modern comic strip and comic book, provide very little data about any particular moment in time, or aspect in space, of an object. The viewer, or reader, is compelled to participate in completing and interpreting the few hints provided by the bounding lines. Not unlike the character of the woodcut and the cartoon is the TV image, with its very low degree of data on objects, and the resulting high degree of participation by the viewer in order to complete what is only hinted at the mosaic mesh of dots.