  A variety of observational tests seem to suggest that the universe is
anisotropic. This is incompatible with the standard dogma based on adiabatic,
rotationally invariant perturbations. We point out that this is a consequence
of the standard decomposition of the stress-energy tensor for the cosmological
fluids, and that rotational invariance need not be assumed, if there is elastic
rigidity in the dark energy. The dark energy required to achieve this might be
provided by point symmetric domain wall network with $P/\rho=-2/3$, although
the concept is more general. We illustrate this with reference to a model with
cubic symmetry and discuss various aspects of the model.
