Available on the Internet Archive, this somewhat trippy, and for sure visionary documentary on hypertext from thirty years ago still keeps to inspire; what with Vannevar Bush, Ted Nelson and all those other pioneers in it.
Many think of designers as those restlessly creative, artist minds whose work consists mainly of producing ever new ideas and concepts. While that kind of work is genuinely fun to do, I have always seen design mostly as the work of digging ever deeper, working out the details, and most importantly taking the perspective of somebody unfamiliar with the subject.
This piece is actually relevant in so many ways; not only does it reverse the logic all of today's media appears to be built upon, but it generally provokes to reconsider the assumed infinity of resources in this world (here: attention of human beings).
Every "sharing" interaction in a digital system has externalities – costs to somebody not involved in the transaction themselves: whenever an individual shares a resource or information about themselves, they are likely also sharing something that isn't theirs.