Leucippus portrait, flat vector illustration

 leucippus, ancient philosopher, greek philosophy, atomism, atomic theory, pre socratic, materialism, philosophy history, democritus teacher, indivisible particles, void concept, matter theory, natural philosophy, physical reality, cosmology, early science, atomic particles, universe structure, philosophical ideas, classical antiquity, rational thought, logical reasoning, metaphysics, ontology, nature study, scientific thinking, theory of matter, early physics, philosophical doctrine, atomistic view, ancient teachings, intellectual tradition, reality nature, fundamental elements, philosophical inquiry, science origins, theoretical thought, philosophical system, early knowledge, greek thinkers