Full Idea
Michael Burke has given an account that avoids distinguishing coinciding entities. ...The statue/lump satisfies both 'lump' and 'statue', but only the latter determines that object's persistence conditions, and so is that object's 'dominant sortal'.
Gist of Idea
Two entities can coincide as one, but only one of them (the dominant sortal) fixes persistence conditions
Source
report of Michael Burke (Dion and Theon: an essentialist solution [1994]) by Theodore Sider - Four Dimensionalism 5.4
Book Reference
Sider,Theodore: 'Four Dimensionalism' [OUP 2003], p.161
A Reaction
Presumably a lump on its own can have its own persistance conditions (as a 'lump'), but those would presumably be lost if you shaped it into a statue. Burke concedes that. Can of worms. Using a book as a doorstop...