analyse an ensemble of $N$-body simulations in a volume equal to that of the two-degree Field Galaxy Redshift Survey [2dFGRS, @C01] where the probability to find peculiar structures (overdense and underdense) was thus estimated to be $\sim$2 per cent and not null.

Superclusters allow in principle both to study dynamical processes such as cluster-cluster collisions and group-cluster mergers and to sample different environments from cluster cores to filaments and fields. Furthermore, within a dynamically active and locally dense structure the probability to observe evidence of environmental effects on galaxy evolution is dramatically enhanced making these systems a sort of [*magnifying glass*]{} to identify the different physical mechanisms which transform the properties of galaxies. In order to address all these aspects, a careful selection of the target is fundamental. The ideal structure should map different environments with evidence of cluster-cluster interactions. Finally, in order to study in detail the galaxy properties a resolution $\lesssim 1$kpc is required in a wide range of galaxy mass down to the dwarf regime where such galaxies are not quenched by internal processes, but are more susceptible to environmental transformations. With all this in mind, we have undertaken a study of the Shapley supercluster which is 