Figure 2

Representative 3D projections of the segmented spheres (diameter = 1 mm) inside a cylindrical container (inner diameter = 25 mm) in the initial state in (a) XY, (b) YZ – planes (c) 3D and at 180 Hz, 0.6 mm shaking amplitude in (d) XY, (e) YZ – planes and (f) 3D.