Welcome to Light On Light Through, Episode 93, in which I explore how Marshall McLuhan's "tetrad" or four laws of media, first publicly propounded in the mid-late 1970s, can explain the "selfie" which didn't exist until a few years ago and is so vividly in evidence today.

This is the photograph which instigated this train of thought - thanks to Ian Bogost for pushing it out of the station.

You might also enjoy this podcast episode: Marshall McLuhan and the Kindle. See also Tetrad on Eyeglasses Fliiping into Google Glass and Photography Flips into Snapchat.

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