The term 'extension' in the depth-psychology and philosophically adjacent corpus traverses several registers that resist simple unification. In Plotinus, extension belongs fundamentally to the lower order of quantitative, spatially parcelled existence: the One and Soul are explicitly 'great not in extension but in power,' and the Soul's omnipresence must be grasped not as a literal spreading-out across distance but as a unity whose adequacy to all things defeats measurement. This Plotinian polarity — magnitude-extension versus power-depth — recurs in Aurobindo, who reads Time and Space as the One Conscious-Being 'viewing itself in extension,' subjectively and objectively, a formulation that makes extension the self-alienating movement of the Absolute into multiplicity. For Aurobindo, the liberated soul's 'extension' into other souls is not spatial propagation but a contagion of divine self-consciousness. McGilchrist's contribution concerns the paradoxical breakdown of continuous extension into serial slices — Zeno's problem — as symptomatic of left-hemisphere analytical fragmentation. Neumann situates pre-conscious spatial extension in the mythical body-world continuum that precedes abstract measurement. Together these voices construct a field in which extension is neither simply Cartesian res extensa nor empty container, but a contested mediating category between unity and multiplicity, power and quantity, lived flow and analytical partition.
great not in extension but in power, sizeless by its very greatness as even its immediate sequents are impartible not in mass but in might
Plotinus establishes the foundational contrast between spatial extension (quantity, magnitude) and genuine greatness, which belongs to power and unity alone, explicitly displacing extension from the category of the highest real.
, The Six Enneads, 270thesis
we must understand this adding of extension not as a literal increase but in the sense that the soul, essentially a unity, becomes adequate to omnipresence; its unity sets it outside of quantitative measurement
Plotinus reinterprets soul's apparent extension as a figure for its non-quantitative omnipresence, insisting that true unity is incommensurable with spatial or numerical extension.
, The Six Enneads, 270thesis
Time and Space are that one Conscious-Being viewing itself in extension, subjectively as Time, objectively as Space
Aurobindo reframes extension as the self-reflexive movement of Conscious-Being, making space and time two aspects of a single extended self-viewing rather than independent metaphysical containers.
, The Life Divine, 1939thesis
the infinity of the One has translated itself into an extension in conceptual Time and Space; secondly, the omnipresence of the One in that self-conscious extension translates itself into a multiplicity of the conscious soul
Aurobindo maps the descent from unity to multiplicity as a two-stage translation: first into conceptual extension (Time-Space), then into plural soul-forms inhabiting that extended field.
, The Life Divine, 1939thesis
whenever even a single soul is liberated, there is a tendency to an extension and even to an outburst of the same divine self-consciousness in other individual souls
Aurobindo employs extension figuratively to describe the propagation of liberated consciousness outward into other souls, where the term carries contagion rather than spatial spread.
, The Life Divine, 1939supporting
the power handles the new load with no need of distributing itself over the increased area… retaining the power it exerted: is not that power, the impart
Plotinus uses the analogy of a hand controlling a plank to argue that controlling power does not distribute itself over extension, thereby severing causal efficacy from spatial reach.
, The Six Enneads, 270supporting
this infinity of power must also have its counterpart… and in this too the source is present throughout the full extension of its
Plotinus identifies temporal extension as the counterpart of eternal power, grounding the very existence of extended time in the stationary infinite that subtends it.
, The Six Enneads, 270supporting
a cosmic vision which is all-comprehensive, all-pervading, all-inhabiting. Because it comprehends all things in being and static self-awareness, subjective, timeless, spaceless, therefore it comprehends all things in dynamic knowledge and governs their objective self-embodiment in Space and Time
Aurobindo contrasts the supramental's transcendence of spatial-temporal extension with its capacity to govern extension from above, showing extension as subordinate to a spaceless knowledge.
, The Life Divine, 1939supporting
Originally there were no abstract spatial components… things and places were organized into an abstract system and differentiated from one another; but originally thing and place belonged together in a continuum
Neumann situates abstract spatial extension as a late product of developing consciousness, contrasting it with the mythical, undifferentiated spatial continuum of the unconscious.
, The Origins and History of Consciousness (Princeton, 2019supporting
Many paradoxes involve the breaking down of a flow into parts or slices… the paradoxes of Zeno of Elea… inviting the conclusion that motion is impossible
McGilchrist uses Zeno's paradoxes to illustrate how the analytical serialisation of continuous spatial extension generates irresolvable contradictions, implicating left-hemisphere fragmentation of lived flow.
, The Matter With Things: Our Brains, Our Delusions and the Unmaking of the World, 2021supporting
the soul belongs to that other Kind… at once a self-enclosed unity and a principle manifested in diversity
Plotinus characterises the soul's relation to embodied extension as paradoxical: it enters extended matter without ever being distributed across it, remaining a non-extended unity throughout.
, The Six Enneads, 270supporting
Descartes rejected the metaphor of the soul as a pilot of its ship… There is nothing my nature teaches me more vividly than that I have a body
Thompson's account of the Cartesian separation of res cogitans from res extensa provides historical context for the dualism that depth-psychological treatments of extension implicitly contest.
, Mind in Life: Biology, Phenomenology, and the Sciences of Mind, 2007aside