Projected density field of DM and halos in a region of 1000×1000×20 h⁻³Mpc³ from seven different cosmologies at redshift z = 0.5. The upper panels display the DM density field and the lower panels the corresponding halo density field for the MG models, as labelled. These maps highlight the remarkable similarity in the density fields of MG and ΛCDM models. They also show that some models give rise to the formation of pronounced filaments, characterised by either a substantial thickness or a substantial length, as well as an increased prevalence of halos.