Let M be a metric space. We
observe that Lip(M) has a striking lattice structure: its closed unit ball is
lattice-complete and completely distributive. This motivates further study into the
lattice structure of Lip(M) and its relation to M. We find that there is a
nice duality between M and Lip(M) (as a lattice). We also give an abstract
classification of all normed vector lattices which are isomorphic to Lip(M) for some
M.