The invariants to specify the persisting object have been described earlier. Perceiving the persisting identity of an object or surface that changes shape . This refers to the surface of a non-rigid substance. A mechanical event changes its layout but does not rupture or break up the surface, certain topological invariants will persist. Perceiving the persisting identity of an organism or an animal .
Organisms increase in size, that is, grow, and also decay.
These changes are not reversible. Such change is slow. A more rapid and more significant change is the deformation that goes with animal locomotion and behavior. Call it movement as distinguished from motion. The persisting identity of the non-rigid object we call an animal is perceived despite radical deformations of its surface.