Concepts
Graph Sculpting - options for precisely controlling what’s visible on the graph an what isn’t
There’s two primary ways of achieving this: hiding nodes and fading nodes.
One idea for achieving this is node selection (the ability to select nodes, without navigating them) and contextual menus (menus that appear when right-clicking on a node).
Example
I might select two particular MOCs (Maps Of Content), right click on either of them, and select from the contextual menu to either hide or fade them.
This would work well with an option to color nodes on the fly.
Example
I might select a node and all nodes within 2 degrees of separation of it, and select from the contextual menu, to color them green.
This would open up the possibility to later hide or fade all nodes of a particular color.