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This invention harnesses the inherent scalability of fiber production and in-fiber Plateau-Rayleigh capillary instability for the fabrication of uniformly sized, structure spherical particles spanning an exceptionally wide range of sizes.  Composite and spherical particles are produced by arranging a variety of structures and materials in a macroscopic scaled-up model of the fiber. These particles can include core-shell particles, two-compartment 'Janus' particles, and multi-sectioned 'beach ball' particles.