Cyberspace: The tablet becomes a page becomes a screen becomes a world, a virtual world. Everywhere and nowhere, a place where nothing is forgotten and yet everything changes.Michael Benedikt,"Introduction" to Cyberspace: First Steps. Cambridge, MA: MIT Press, 1991.
This poetic description is alluding to the history of written communication and how digital media has effected communication, as this part of the site shows. Sensationalism has made it seem that the linking of computers to form a network is a brand-new form of communication, but it is more accurately seen as the next step in a continuum of evolving means of sharing text.
This also refers to the idea that once information is written down, it becomes part of the memory and does not disappear. It does not have to be remembered in our heads, as Plato desired, because it is being virtually remember by means of a written code.
Saying "everything changes" connotes two ideas integral to cyberspace. First, is the disintegration of information. Errors are made as texts and transferred so the text evolve over time. Second, the web of information is always changing as new sites come into being and old ones are abandoned.