2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/2045Observational evidence for the presence of a preferred scale around 100 Mpc in the distribution of high-density regions in the Universe is summarised. Toy models with various degrees of regularity are analysed to understand better the observational data. Predictions of models which produce a feature on the initial power spectrum of matter are analysed and compared with new observational data on the CMB angular spectrum, cluster mass function, and galaxy and cluster power spectrum.LaTex (sty files added), 10 pages, 5 PostScript figures embedded, in ``9th Marcel Grossmann Meeting on relativistic astrophysics'', ed. R. Ruffini, World Scientific, Singapore (in press)Astrophysicstext