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 di
stributive. This motivates further study into the lattice structure of
Lip(M) and its relation to M. We find that there is a nice duality be
tween M and Lip(M) (as a lattice). We also give an abstract classifica
tion of all normed vector lattices which are isomorphic to Lip(M) for
some M.