Slice of a zoom-in on a region centred at a R_e ≈ 40 Mpc void at ℓ = 0 (solid dark blue line), together with its largest sub-void at ℓ = 1 (dash-dotted light blue line), and a substructure of that sub-void at ℓ = 2 (dashed white line). The slice is 5 Mpc in depth. The colour palette displays the integrated density contrast. The analysis was performed on a snapshot of a MASCLET simulation at z = 0. Additional substructures were obtained for the same void and its sub-voids; however, only one of each level is shown for the sake of clarity.