  This paper shows that there are no {\em 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. Also, with matter present, there is no physical
metastable state. However, the free energy is lowered by the matter. This
effect is described in terms of physical variables.
