Aufhebung
Ship of Theseus
Answers before the problem.
Aristotle's Four Causes as Three Aspects of Being:
Material (Material), Form (Form), Function (Efficient, Final)
Note that efficient cause (how) and final cause (why) are combined in the definition of function so as to make the definition of function more elastic.
1) Material change does not necessarily change the form nor does it necessarily change the function of something.
2) Formal change does not necessarily require material change nor does it necessarily require functional change.
3) Functional change does not necessarily require material change nor does it necessarily require formal change.
As roles are often an encapsulation of function, here is one approach to change in terms of materiality:
A cargo cult and a sculptor and a baker and an engineer and a shipbuilder ... give something a form, but the materiality of that form often determines its possible function.
A cargo cult and a sculptor and a baker and an engineer and a shipbuilder ... have a sense of function as such, but the material conditions of an enacted function often determine its effectiveness.
