Slice of a matter-antimatter simulation of a small volume in the D–M universe using a modified version of the RAMSES simulation code. The thickness of the slice is 20% of the simulation box, of comoving size 1 h⁻¹ cMpc. The condensed structures (represented in light blue) are all made of matter, while antimatter is spread in nearly homogeneous extended halos (represented in red) over half of the volume. The other half of the volume is occupied by depletion zones, surrounding the matter galaxies and clusters, isolating them from antimatter. These depletion zones are a consequence of the gravitational polarization expected between positive mass and “negative mass” objects. We note that antimatter clouds percolate, i.e., it is possible to roam at infinity without leaving the antimatter cloud, and the same property is respected for the depletion zones surrounding matter.