  We construct a model in which four dimensional chiral fermions arise on the
boundaries of a five dimensional lattice with free boundary conditions in the
fifth direction. The physical content is similar to Kaplan's model of domain
wall fermions, yet the present construction has several technical advantages.
We discuss some aspects of perturbation theory, as well as possible
applications of the model both for lattice QCD and for the on-going attempts to
construct a lattice chiral gauge theory.
