That which rearranges a whole's parts and their relations. It changes what is possible without changing what is there.
An agent noun built on restructure, from re- (Latin, again) attached to structure, from Latin structura (a fitting together, a building), from struere (to pile, to build); a restructurer rearranges the piled-together parts without changing what is there.
That which rearranges a whole's parts and their relations. It changes what is possible without changing what is there, in the same way the root's piling can be rebuilt without adding or removing a single stone.