Image 1 Caption: A diagram of the large-scale structure of the universe of the local universe out to ∼ 150 Mpc = 0.15 Gpc (∼ 1 % of the observable universe radius = 14.3 Gpc) from the center at the unlabeled Milky Way: i.e., to cosmological redshift z ≅ 0.035 and lookback time ∼ 0.5 Gyr.
Features:
The model used is Λ-CDM model which has been the standard model of cosmology (SMC, Λ-CDM model) since circa 1998. However, it may need revision or replacement. See /big_bang_cosmology_limitations.html.
The web-like nature of the large-scale structure of the universe is somewhat apparent---hence the modern name for the large-scale structure the cosmic web.
Yours truly thinks it's more like "cosmic foam".
Features of the Laniakea Supercluster:
Superimposed on the recession velocities of galaxies due to the expansion of the universe are peculiar velocities.
One can define a closed surface in space, where the peculiar velocities go to zero. Going outward from the closed surface the peculiar velocities point outward; going inward, they point inward.
The closed surface is analogous to the watershed for internal drainage basin.
Laniakea is defined by a closed surface such as which we have just specified (see, e.g., Tempel 2014). Alas, applying the specification of the closed surface requires vast amounts of accurate/precise data which so far is only available for Laniakea itself. In fact, there may never be another Laniakea-like-defined supercluster or at least none so accurately defined as Laniakea itself.
In other words, sphere have reached or nearly reached the size scale 370 Mpc (see observable_universe_cosmological_principle.html). where the cosmological principle applies: i.e., observable universe is homogeneous (i.e., same in all places) and isotropic (i.e., same in all directons) on a large enough scale.
There are rarely greater large-scale structures than those we see in Image 1 and Image 2. There is seems to be a limit to their size---an End of Greatness.
Note that 370 Mpc = 0.370 Gpc is a significant fraction of the observable universe which has radius 14.3 Gpc (≅ 46.6 Gly) according to the Λ-CDM model as aforesaid (see Wikipedia: Observable universe).