Composition of Visualization Paradigms
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Fisheye treemaps
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Traditionally, you can select a node in a treemap to become a new root node.
But then you lose context.

Try a fisheye view (non-linear magnification) to see details without losing context.

Seamless multi-level view: define discrete levels of detail of information.

Global and local magnification
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Pan & zoom: intuitive, arbitrarily high level of zoom.

Lose context when zoomed in; lose detail when zoomed out.

Compose non-linear magnification to aid navigation.  Interactively probe regions
at about 10x magnification without loss of context before committing to full zoom.

Fisheye up to any scale.

Collapse pan & zoom operations into a single probe operation.

Smoothly transition from fisheye view to full zoom.