Above all, the translation of books into digital formats means the destruction of boundaries. Bound, printed texts are discrete objects: immutable, individual, lendable, cut off from the world.
The biggest neurological turn-on for people is other people. This is what really excites us. In reward terms, it's not money; it's not being given cash - that's nice - it's doing stuff with our peers, watching us, collaborating with us.
In classrooms full of students who range from brilliant to sullen disaffection, it's games - and often games alone - that I've seen engage every single person in the room. For some, the right kind of play can spell the difference between becoming part of something, and the lifelong feeling that they're not meant to take part.
From exam grading to health education to professional training to democratic participation, paths towards self-realization and success in the world are often daunting and obscure: journeys only the privileged feel confident setting off along.
The earliest known writing probably emerged in southern Mesopotamia around 5,000 years ago, but for most of recorded history, reading and writing remained among the most elite human activities: the province of monarchs, priests and nobles who reserved for themselves the privilege of lasting words.
If computers remain far worse than us at image recognition, a certain over-confident combination of man and machine can elsewhere take inaccuracy to a whole new level.