It is not just writing. Music, another invention, also alters the brain in a sustainable way. Many studies have shown how listening to music strengthens the communication wiring between brain hemispheres. Beside fostering an expected growth in auditory regions of the brain, regularly playing musical instruments significantly strengthens the thickness of the corpus callosum fibers and activates the cerebral cortex.  Our mind makes a drum and flute, and the drum and flute remakes our mind.

Digital technology gives the professional a new language as well. An image stored on a memory disc instead of celluloid film has a plasticity that allows it to be manipulated as if the picture were words rather than a photo. Hollywood mavericks like George Lucas have embraced digital technology and pioneered a more fluent way of filmmaking. In his “Star Wars” films, Lucas devised a method of moviemaking that has more in common with the way books and paintings are made than with traditional cinematography.

The overthrow of the book would have happened long ago but for the great user asymmetry inherent in all media. It is easier to read a book than to write one; easier to listen to a song than to compose one; easier to attend a play than to produce one. But movies in particular suffer from this user asymmetry. The intensely collaborative work needed to coddle chemically treated film and paste together its strips into movies meant that it was vastly easier to watch a movie than to make one. A Hollywood blockbuster can take a million person-hours to produce and only two hours to consume. But now, cheap and universal tools of creation (megapixel phone cameras, Photoshop, iMovie) are quickly reducing the effort needed to create moving images. To the utter bafflement of the experts who confidently claimed that viewers would never rise from their reclining passivity, tens of millions of people have in recent years spent uncountable hours making movies of their own design. Having a ready and reachable audience of potential millions helps, as does the choice of multiple modes in which to create. Because of new consumer gadgets, community training, peer encouragement and fiendishly clever software, the ease of making video now approaches the ease of writing.