  In the large dimension ($D$) limit, Einstein's equation reduces to an
effective theory on the horizon surface, drastically simplifying the black hole
analysis. Especially, the effective theory on the black brane has been
successful in describing the non-linear dynamics not only of black branes, but
also of compact black objects which are encoded as solitary Gaussian-shaped
lumps, {\it blobs}. For a rigidly rotating ansatz, in addition to axisymmetric
deformed branches, various non-axisymmetric solutions have been found, such as
black bars, which only stay stationary in the large $D$ limit.
  In this article, we demonstrate the blob approximation has a wider range of
applicability by formulating the interaction between blobs and subsequent
dynamics. We identify that this interaction occurs via thin necks connecting
blobs. Especially, black strings are well captured in this approximation
sufficiently away from the perturbative regime. Highly deformed black dumbbells
and ripples are also found to be tractable in the approximation. By defining
the local quantities, the effective force acting on distant blobs are evaluated
as well. These results reveal that the large $D$ effective theory is capable of
describing not only individual black holes but also the gravitational
interactions between them, as a full dynamical theory of interactive blobs,
which we call {\it brane blobology}.
