  Our universe hosts various large-scale structures from voids to galaxy
clusters, so it would be interesting to find some simple and reasonable measure
to describe the inhomogeneities in the universe. We explore two different
methods for this purpose: the Kullback-Leibler entropy and the Weyl curvature
tensor. These two quantities characterize the deviation of the actual
distribution of matter from the unperturbed background. We calculate these two
measures in the spherically symmetric Lemaitre-Tolman-Bondi model in the dust
universe. Both exact and perturbative calculations are presented, and we
observe that these two measures are in proportion up to second order.
