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When I think about zooming, I think of how Google maps work and also about responsive web design. That is to say, having differing amounts of information show at different zoom levels. It was my impression that this is how the Oberon desktop works but I may be mistaken in that assumption.

At 1:1, imagine a regular view.

Below some threshold effective resolution, imagine condensed information. Instead of miniature, unreadable windows, one might display a simplified view, say a Metro-style color coded box with -- relative to box size -- a big icon and document title.

Below yet another threshold, condense more, using conventional icons instead of Metro.

At lowest zoom level, display a one-dimensional list of everything. Searchable of course.