Particles belonging to the Virgo simulacra (top) and to random halos (bottom) at redshift zero are shown at different redshifts: 5, 2, 0.5, 0.25, and 0 from dark blue to red. While the position of the Virgo halos is constrained that of random halos is not thus the latter are relocated at (0, 0, 0) while for the former a cross indicates the center of the box. The gathering of particles forming the Virgo halos at redshift zero is extremely similar for every halo. On the opposite, although they have similar masses, the random halos present aggregation histories along various orientations. Masses are given in h ⁻¹ M_⊙ for each halo.