 Bohm’s (1980, 1993) reflections on quantum mechanics led him to adopt a more general holism. He believed that not just quantum object and apparatus, but any collection of quantum objects by themselves, constitute an indivisible whole. This may be made precise in the context of Bohm’s (1952) interpretation of quantum mechanics by noting that a complete specification of the state of the “undivided universe” requires not only a listing of all its constituent particles and their positions, but also of a field associated with the wave-function that guides their trajectories. If one assumes that the basic physical parts of the universe are just the particles it contains, then this establishes ontological holism in the context of Bohm’s interpretation. But there are alternative views of the ontology of the Bohm theory (see the entry  Bohmian mechanics).