For the linear field as practiced by Robert Duncan, the continuation happened in a direction, onward in the poem. In a conjunctive cluster directionality is not onward but inward, toward an abstraction of the cluster as something in a fixed spot, a center, a locality. An arena in which acts occur on the text, perhaps in which the text itself acts. Word objects that behave . It is not a coincidence that the poetics of the 60s made a strong connection between fields and time sequences.
Space replaces time.
The field is a container. Fields can be combined by nesting them, or stacking them, or adjoining them, or doing the virtual equivalent of connecting them with wires. Fields combine in a network . The feedback loop is a difficult structure. Computer programs normally deal very poorly with feedback loops.