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The presence of a velocity field created by using the rotors enables the transport of large, dispersed objects like the vesicles in this figure (large dark circle). The flow is created by using a carpet of surface walkers randomly positioned (bright, short, chain-like regions) actuated at 32 Hz. The snapshots are taken from the top, as indicated in the cartoon. The scale bar represents 20 μm, and the time between frames is 0.5 s.
