Vaisheshika articulates a rigorously realist and atomistic vision of the material world, in which atoms (paramāṇu) are affirmed as the ultimate physical reals. These atoms are described as eternal, indivisible, partless, and imperceptible, serving as the smallest units out of which all gross, perceptible bodies are composed. They are not themselves produced or destroyed; rather, what arises and perishes are the various configurations into which they enter. In this way, the stability of an underlying physical substratum is preserved, even amid the ceaseless flux of appearances. Space, time, self, and mind are treated not as atomic composites but as distinct, non-atomic realities that provide the wider framework in which atomic processes unfold.

Within this framework, Vaisheshika typically distinguishes four kinds of material atoms, corresponding to earth, water, fire, and air. These elemental atoms, through their intrinsic natures, ground the diverse sensible qualities encountered in the world—such as smell, taste, color or form, and touch—though these qualities become manifest only in appropriate combinations. The tradition explains that two atoms first unite to form a dyad, and further combinations of such minute units eventually yield aggregates large enough to be perceived. All ordinary objects, from bodies to mountains, are thus understood as structured groupings of these imperceptible constituents. The multiplicity of forms is traced back to differences in atomic type, arrangement, and conjunction.

Change, causality, and cosmic process are interpreted as the rearrangement of these enduring atoms rather than as their origination ex nihilo. Production and destruction signify new patterns of combination and separation, while the atoms themselves remain unaffected in their essential nature. The movement and ordering of atoms are not regarded as random, but as governed by an unseen causal factor and divine agency, often linked with the law of karma. In this way, the system preserves both the autonomy of a mind-independent physical reality and a meaningful moral and cosmological order. The result is a distinctive atomistic realism, in which the manifest universe is a vast, law-governed tapestry woven from eternal, imperceptible atomic threads.