Full Idea
A statue is a kind of object which cannot survive much change to its shape, unlike a lump of bronze, which cannot survive any change to its material composition.
Gist of Idea
Statues can't survive much change to their shape, unlike lumps of bronze, which must retain material
Source
E.J. Lowe (A Survey of Metaphysics [2002], p.70)
Book Reference
Lowe,E.J.: 'A Survey of Metaphysics' [OUP 2002], p.70
A Reaction
Also the statue could survive being hollowed out, changing its material composition. Hence a statue is not just a lump of bronze, but we knew that.