Brightness occupies a remarkably heterogeneous position in the depth-psychology corpus, appearing as cosmological principle, neurological datum, alchemical symbol, and I Ching hexagram-attribute simultaneously. In the Sino-divinatory tradition—represented principally by the Li hexagram commentators Wang Bi, Alfred Huang, and Rudolf Ritsema—brightness (MING) functions as the light-giving aspect of consciousness itself, the radiance of Fire and heavenly bodies that must sometimes be deliberately hidden lest it consume its bearer. Here the tension between manifest illumination and concealed intelligence is generative rather than merely descriptive. Henry Corbin's Iranian Sufi material introduces a subtler register: brightness is graduated across a spectrum of photisms, from sensory colour-visions to the paradoxical 'black light' of the highest mystical states, where luminosity becomes ontologically prior to any object it might illuminate. John of Damascus positions angelic brightness within a theological hierarchy in which rank and luminosity are mutually constitutive. McGilchrist's neuroscientific frame treats brightness perception as lateralized, locating a 'brightness agnosia' in right-hemisphere damage—a finding that triangulates unexpectedly with the mystical literature's insistence that true brightness is apprehended by something other than ordinary vision. Barrett's affective-science perspective aligns brightness with interoception as a fundamental datum of consciousness, not an occasional quality. Across these traditions the persistent tension is between brightness as a property of external objects and brightness as an inner, transformative, or even dangerous force of consciousness.
Brightness, MING: light-giving aspect of burning, heavenly bodies and consciousness; with fire, the Symbol of the trigram Radiance, LI. Hide, YI: keep out of sight
This passage establishes brightness as a technical I Ching concept (MING) synonymous with the light of consciousness itself, and introduces the core paradox of the Brightness Hiding hexagram—that intelligence must sometimes be deliberately concealed.
, I Ching: The Classic Chinese Oracle of Change, 1994thesis
The ancients picked the bright color of the bird to signify the character Li; thus, Li symbolizes brightness, though that is not its literal meaning. It is associated with Fire, the sun, and the most yang energy.
Huang traces the etymological and cosmological grounding of the Li hexagram as 'Brightness,' linking the character's bird-imagery to fire, solar energy, and maximum yang—establishing brightness as an irreducibly symbolic rather than merely optical quality.
, The Complete I Ching: The Definitive Translation, 1998thesis
brightness begins to change: it had been dark but now begins to dawn; it had been submerged but now begins to emerge... As the brightness begins to propagate, its blaze begins to surge.
Wang Bi's commentary dramatizes brightness as a dynamic, temporally unfolding force—one that, if pushed too aggressively in the wrong positional moment, consumes itself and is 'discarded,' illustrating the dangerous ambivalence of illuminating power.
, The Classic of Changes: A New Translation of the I Ching as Interpreted by Wang Bi, 1994thesis
they differ from each other in brightness and position, whether it is that their position is dependent on their brightness, or their brightness on their position: and they impart brightness to one another
John of Damascus presents angelic brightness as both an ontological rank-indicator and a relational, communicable quality, raising the philosophical question of whether luminosity is cause or consequence of hierarchical standing.
, An Exact Exposition of the Orthodox Faith, 2021thesis
The photisms of pure light thus described correspond to the state of the heart which is that of the 'pacified soul.' The colored photisms which Najm Razi proceeds to describe rise step by step
Corbin documents Najm Razi's doctrine of photisms—graduated colored brightnesses corresponding to successive stages of mystical purification—positioning brightness not as a single state but as a spectrum of inner light correlated with degrees of soul-development.
, The Man of Light in Iranian Sufism, 1971thesis
According to whether what appears to you is light or darkness, your witness (shahid) is light or darkness... if light prevails over darkness or vice versa
In Corbin's Sufi framework, brightness perceived in inner vision functions as a spiritual diagnostic—a 'scale' measuring the purity or disfigurement of the soul's condition.
, The Man of Light in Iranian Sufism, 1971supporting
Near total inability to determine brightness, a so-called 'brightness agnosia', without impairment of other aspects of visual perception, has been reported in a subject with right hemisphere damage
McGilchrist marshals neurological evidence that brightness perception is specifically right-hemisphere dependent, a finding that implicitly supports his broader thesis about the right hemisphere's priority in grasping the qualitative, holistic aspects of experience.
, The Matter with Things: Our Brains, Our Delusions, and the Unmaking of the World, 2021supporting
Near total inability to determine brightness, a so-called 'brightness agnosia', without impairment of other aspects of visual perception, has been reported in a subject with right hemisphere damage
This parallel citation confirms the neurological localization of brightness-perception to the right hemisphere, reinforcing the claim that luminosity as a gestalt quality is processed differently from other visual attributes.
, The Matter With Things: Our Brains, Our Delusions and the Unmaking of the World, 2021supporting
Affect, you may recall, depends on interoception... affect is a fundamental aspect of consciousness, like brightness and loudness. When your brain represents wavelengths of light reflected from objects, you experience brightness and darkness.
Barrett deploys brightness as the primary analogy for affect's status as a continuous, non-optional background feature of consciousness, arguing that both arise from representational processes rather than discrete stimulus-responses.
, How Emotions Are Made: The Secret Life of the Brain, 2017supporting
Brightness alternates to Adorning (22)... Nine at the fourth place is firm and strong. Its situation is likened to the rising of the sun.
Huang's commentary on the alternating lines of the Li hexagram illustrates how brightness is understood in the I Ching as a condition that cycles through intensification and sudden collapse, analogous to the career of solar light.
, The Complete I Ching: The Definitive Translation, 1998supporting
He is at the top of the lower gua, denoting that brightness has reached its climax, like the sun at noon. He responds to the topmost
The passage illustrates the I Ching's principle that maximum brightness represents a threshold condition—an apex that necessarily precedes decline—embedding the concept within a cyclical cosmological framework.
, The Complete I Ching: The Definitive Translation, 1998supporting
the world of colors in the pure state, that is, the orbs of light, is the totality of the acts of this Light which makes them lights and cannot itself be manifested except by these acts, without ever being itself visible.
Corbin articulates a Sufi metaphysics in which ultimate brightness is paradoxically invisible in itself—knowable only through its colored epiphanies—a structure that mirrors the mystical doctrine of the hidden God who reveals through light.
, The Man of Light in Iranian Sufism, 1971supporting
Light... has the quality or 'power' of brightness, but not that of heat, possessed by the other two varieties. We do not feel li
Plato's Timaeus distinguishes brightness as a specific elemental 'power' of fire-derived light—separable from heat—establishing an early philosophical basis for treating luminosity as a distinct perceptual and ontological quality.
, Plato's cosmology the Timaeus of Plato, 1997supporting
Shine, KUANG: illuminate, give off brilliant, bright light; honor, glory, éclat; result of action, contrasts with brightness, MING, light of heavenly bodies.
Ritsema draws a critical technical distinction between KUANG (shine—a human or action-generated brilliance) and MING (brightness—the inherent luminosity of heavenly bodies and consciousness), demonstrating that the corpus differentiates sources and qualities of light with precision.
, I Ching: The Classic Chinese Oracle of Change, 1994thesis
the idea of a 'physiology of the man of light,' as outlined in Najm Kobra's theory of the suprasensory senses and Semnanl's theory of subtle organs enveloped in color, links up with Goethe's vast scheme
Corbin connects Iranian Sufi brightness-doctrine to Goethe's physiological colour theory, suggesting a shared framework in which luminous experience is neither purely subjective nor purely physical but belongs to a 'suprasensory' register.
, The Man of Light in Iranian Sufism, 1971aside
primarily light is no appanage of air, and does not depend upon the existence of air: it belongs to every fiery and shining body, it constitutes even the gleaming surface of certain stones.
Plotinus argues for the ontological independence of light from any medium, a position that implicitly grounds the Neoplatonic understanding of brightness as an emanative, self-subsisting principle rather than a property of matter.
, The Six Enneads, 270aside
Kinnaman (1902) had previously demonstrated brightness transposition in monkeys, but Köhler's later work has received more attention.
William James's chapter contextualizes brightness within comparative psychology's study of relational learning, noting that animals respond to brightness ratios rather than absolute values—a finding peripheral to depth-psychological concerns but relevant to perception theory.
, The Principles of Psychology, 1890aside