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     You need imagine no further. Such a system is already available. The cards are stored as 54,000 frames on a videodisc, which can be viewed on a large colour monitor and, thanks to HyperCard, in any order the visitor to this pocket museum desires. It takes little imagination to visualise similar videodiscs which invite students to explore any domain of human knowledge.

      This third vision could still be viewed as an invitation to a student to explore microworlds. However, whereas the microworlds of the first vision are all content with no context, and the microworlds of the second vision are all context with no content, the microworlds of this third vision embeds the content within a context.

      Such preprogrammed videodiscs, which invite students to explore various domains of human knowledge, will play an increasingly important role in education in the future. However, this interactive videodisc technology will also invite students to create their own personal videodiscs. I am currently using HyperCard to create a shell for such creations.

      Imagine a stack of cards which contain all your personal notes and images, favourite quotes and anecdotes, sources and resources, the books you have read and the papers you have written, the lectures you have heard and the speeches you have delivered. That is, a sort of silicon clone of yourself. Let us call it the Siliclone. The Siliclone can be best represented as a filing-cabinet, with ten drawers, and an in-out box on top, which enables you to put information into the drawers and to pull information out of them (see Figure 2).

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