Welcome to Light On Light Through, Episode 130, in which I talk about one of the bedrocks of my "anthropotropic" theory of media evolution -- why some media, such as sight-only silent movies, are obliterated by the advent of newer media like "talkies" (sight and sound), in contrast to other media, such as sound-only radio, which amply survive and even thrive in the advent of newer media like television (sight and sound).

Further reading:

• Human Replay: A Theory of the Evolution of Media
• The Soft Edge: A Natural History and Future of the Information Revolution