Fig. 2: Rough force analysis of magnetic (Fmagnetic) and capillary (Fcapillary) interactions underlying the self-sorting of A-B and A-A.

Photographs of a A-B and c A-A building blocks at air/water interfaces and schematic illustration of the magnetic/capillary interactions; stepwise snapshots as the building blocks of b A-B and d A-A approach. Scale bars: 8 mm.