However, we conjecture these particles produce an effectively pusher -like flow field, 40 based on the individual particle behaviours. This made us optimistic that the Pac-Man particles would emulate the rafting behavior shown by Au@TiO 2 Janus micromotors in order to replace them with our Pac-Man microparticles, leading to a scale-able basis for efficient interaction and capture of microplastics. Actively swimming Pac-Man particles interacted with passive suspended matter, forming increasingly large clusters over time. Similar to their Janus analogues, the raft size is also directly dependent on activity and can be increased with the concentrations of H 2 O 2 (Figure ). Snapshots of the assembly process are simultaneously shown for some H 2 O 2 concentrations and time intervals (Figure , Video S2). Despite the slower average speeds, the formed dynamic clusters reach similar magnitudes compared to the clusters assembled by Janus micromotors in Wang et al.. Especially at higher concentrations the rafts disintegrate and form again. While in the initial seconds the clusters experience rapid growth, the number seems to plateau into non-equilibrium stable states. The clustering and assembly behavior is robust and observed for a variety of materials, such as passive polystyrene particles of different sizes (2 and 5 µm) (Figure ). For the number determination in Figure we used SiO 2 particles to facilitate counting of raft participants because the assembly takes place in a single plane (2D), while the lower density of PS spheres favors 3D assembly.