Reflection trees of graphs as boundaries of Coxeter groups

To any finite graph X (viewed as a topological space) we associate an explicit compact metric space X-r (X), which we call the reflection tree of graphs X. This space is of topological dimension <= 1 and its connected components are locally connected. We show that if X is appropriately triangulated (as a simplicial graph Gamma for which X is the geometric realization) then the visual boundary partial derivative(infinity) (W, S) of the right-angled Coxeter system (W, S) with the nerve isomorphic to Gamma is homeomorphic to X-r (X). For each X, this yields in particular many word hyperbolic groups with Gromov boundary homeomorphic to the space X-r (X).