Independent control and rotational stability of four particles. (a)–(d) Physical diagrams showing particle positions during clockwise rotation around the rectangle’s center: (a) 0°, (b) 15°, (c) 30°, (d) 45°. (e)–(h) Corresponding acoustic field simulations: (e) 0°, (f) 15°, (g) 30°, (h) 45°. Panels (a)–(d) show top-down views of the experimental setup. Panels (e)–(h) show simulated pressure amplitude fields (color scale: red = high pressure, black = low pressure), with green dots indicating target focal positions.