GUI:frame context

A given view into the visual model is defined by four parameters which can be understood as forming the four sides your coordinate space. These parameters set by tags and select the subspace in which to visualize. Perhaps something like this:

• top (TAG): alphabetic A to Z.
• left (REAL): fiction vs. non-fiction
• right (GRANULARITY/FOCUS): broad vs. Fine.
• bottom (UMBRA): owner vs. product