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No revolution in communications media succeeds without a transitional period during which it simply imitates the old system; this gives time for the new system to become accepted and expressive techniques to evolve along with the ability of the audience to interpret them. For example, early printed books imitated manuscripts, and early cinema used fixed cameras in imitation of the fixed viewpoint of the theatre-goer. Electronic screen-based texts intended for critical review or for study will have to be seen to be as good as books before they can demonstrate that they are better. And if effective techniques are to develop naturally in response to the needs of readers and the creative ideas of writers, electronic systems will have to be as open and programmable as books currently are. There is nothing hard-wired about a blank sheet of paper.