  Let K be a 2-dimensional finite flag complex. We study the CAT(0) dimension
of the `Bestvina-Brady group', or `Artin kernel', Gamma_K. We show that Gamma_K
has CAT(0) dimension 3 unless K admits a piecewise Euclidean metric of
non-positive curvature. We give an example to show that this implication cannot
be reversed. Different choices of K lead to examples where the CAT(0) dimension
is 3, and either (i) the geometric dimension is 2, or (ii) the cohomological
dimension is 2 and the geometric dimension is not known.

Group Theory;Geometric Topology