ALT The left panel shows from top to bottom an image of a California blackworm, a 3D simulation of a chain of red beads on a string, and a robotic filament made of connected Hexbug robots. The center panel features a three by three grid of circles, with time increasing from left to right. The top three circles feature T. tubifex worms in a Petri dish with sand particles. The circles are all 35 mm in diameter. Over time, the worm gathers the sand into larger clusters that eventually reaches a steady state. The center three circles show that an active, tangentially-driven filament interacting with non-Brownian passive particles exhibits similar clustering behavior. The diameter of the circles is 50σ. The three bottom circles show a robotic filament composed of connected Hexbug robots moving within a circular arena and collecting styrofoam cubes into clusters. The circles are 1 meter in diameter.