Figure 4 movie: This movie shows the sedimentation process presented in Figure 4. The final state is a 3-phase-stacking. Figure 5 movie: This movie shows the situation presented in Figure 5. Clusters of large particles are formed that then move through the phase of small particles. Figure 6 movie: This movie shows the situation presented in Figure 6. Small particles have been added on top of an equilibrated sedimentation profile. The relaxation process towards equilibrium includes cluster formation and sedimentation of clusters.