Galaxies redshift surveys indicate that our Universe is inhomogeneous. Galaxies form structures such as voids, clusters and filaments. Although this is only the distribution of visible matter there are some strong suggestions that visible matter traces the distribution of dark matter and the real matter distribution is similar. All these structures evolved from small initial fluctuations which started to grow after the last scattering moment. However, different structures evolved in various ways depending on an environment and the closest neighborhood.

During my talk I will present the evolution of cosmic structures in different environments employing the Szekeres model. Main results are that small voids, surrounded by large overdensities, evolve slower then large, isolated voids. On the other hand large voids enhance the evolution of adjourning galaxy clusters, which evolve much faster than isolated clusters.