  This paper shows that there are no physical walls in the deconfined,
high-temperature phase of Z(2) lattice gauge theory. In a Hamiltonian
formulation, the interface in the Wilson lines is not physical. The line
interface and its energy are interpreted in terms of physical variables. They
are associated with a difference between two partition functions. One includes
only the configurations with even flux across the interface. The other is
restricted to odd flux.
