  Composite rigging systems, involving membranes that meet on strings that meet
on monopoles, arise naturally by the Kibble mechanism as topological defects in
field theories involving spontaneous symmetry breaking. Such systems will tend
to freeze out into static lattice type configurations with energy contribution
ultimately be provided by the membranes. It has been suggested by Bucher and
Spergel that on scales large compared with the relevant (interstellar
separation) distance characterising the relevant mesh length, such a system may
behave as a rigidity - stabilised solid, having an approximately isotropic
stress energy tensor with negative pressure, as given by a polytropic index
$\gamma=w+1=1/3$. It has recently been shown that such a system can be rigid
enough to be stable if the number of membranes meeting at a junction is even
(though not if it is odd). Using as examples an approximately O(3) symmetric
scalar field model that can provide an ``8 color'' (body centered) cubic
lattice, and an approximate U(1)$\times$ U(1) model offering a disordered ``5
color'' lattice, it is argued that such a mechanism can account naturally for
the observed dark energy dominance of the universe, without ad hoc assumptions,
other than that the relevant symmetry breaking phase transition should have
occurred somewhere about the Kev energy range.
