# Vocabulary for Weakly Bounded Bodies | Plasmatic Multitudes

Source: https://mesmerprism.com/plasmatic-multitudes/terminology.html
Canonical HTML: https://mesmerprism.com/plasmatic-multitudes/terminology.html
Generated: 2026-05-26
Description: Terms for semi-corporeal avatars, plasmatic bodies, particle bodies, swarm bodies, aura avatars, boundary precision, pseudo-haptics, and related design concepts.
Markdown: https://mesmerprism.com/plasmatic-multitudes/terminology.md
Plain text: https://mesmerprism.com/plasmatic-multitudes/terminology.txt
BibTeX references: https://mesmerprism.com/plasmatic-multitudes/terminology.bib
CSL JSON references: https://mesmerprism.com/plasmatic-multitudes/terminology.references.csl.json

---

Field guide | Updated May 24, 2026

# Vocabulary / Field Terms

 This guide maps the terms different fields use for the same design problem: how bodies
 remain legible while their boundaries soften, become permeable, or become collective.

## How to use the vocabulary

 These terms are not treated as perfect synonyms. Somaesthetics anchors the method,
 while media theory, XR design, perception research, and pain translation each
 emphasize different aspects of the same body problem.

 Each entry points back to the shared [sources page](https://mesmerprism.com/plasmatic-multitudes/references.html)
 so the vocabulary stays tied to sources rather than floating as mood language.

## How the vocabularies relate

 No single discipline owns these bodies. Somaesthetics provides the method stance:
 embodied experience is primary, so boundary terms matter when they reorganize perception,
 action, and felt bodily meaning. Media theory then names staged transitions and image
 genealogies; XR work names rendering modes and interaction grammars; perception research
 explains how coherence survives soft boundaries; computational morphogenesis names
 many-agent body formation; and pain translation asks what boundary change does when
 body representation already matters clinically
 ([Shusterman](https://www.interaction-design.org/literature/book/the-encyclopedia-of-human-computer-interaction-2nd-ed/somaesthetics); [Hook et al.](https://doi.org/10.1145/2598510.2598561); [Eisenstein](https://seagullbooks.org/products/on-disney); [dos Anjos and Pereira](https://arxiv.org/abs/2405.02672); [Wagemans et al.](https://doi.org/10.1037/a0029333); [Pahng et al.](https://arxiv.org/abs/2512.17129); [Bullington](https://doi.org/10.1007/978-94-007-6498-9)) .

 The vocabulary map shows how the terms cluster, where they come from, and which one best
 explains what the body is doing: staying coherent, changing boundary, entering relation,
 or becoming experimentally useful.

## Use this term when

 Use this term
 When the emphasis is

 Weakly bounded body
 A soft or unstable bodily edge.

 Semi-corporeal avatar
 An avatar present enough for embodiment without full solidity.

 Plasmatic body
 Changeability and refusal of fixed form.

 Particle body
 Many-part rendering and dynamic density.

 Swarm body
 Coordinated collective motion.

 Aura avatar
 Relational field, proximity, or touch metaphor.

 Pseudo-haptics
 Visually or cross-modally inferred material feel.

 Boundary precision
 The sharpness, permeability, or controllability of the body's edge.

## Core umbrella terms

 Somaesthetics

 A pragmatic discipline that treats the lived body as the medium of perception,
 action, and self-presentation. On this site it names the method anchor: boundary
 design matters because it reshapes embodied experience rather than merely changing
 the body's image.

 Best used when the emphasis is on felt bodily experience, somatic awareness, and
 design from within rather than appearance alone
 ([Shusterman](https://www.interaction-design.org/literature/book/the-encyclopedia-of-human-computer-interaction-2nd-ed/somaesthetics); [Hook et al.](https://doi.org/10.1145/2598510.2598561)) .

 Weakly bounded body

 A body whose edge is soft, distributed, permeable, or unstable while remaining
 readable as a body. This is the broadest public-facing phrase on the site because
 it names the central problem without locking the body to one historical register.

 Best used when the emphasis is on boundary condition and felt self-boundary rather
 than rendering style
 ([Shusterman](https://www.interaction-design.org/literature/book/the-encyclopedia-of-human-computer-interaction-2nd-ed/somaesthetics); [Wagemans et al.](https://doi.org/10.1037/a0029333); [Johansson](https://link.springer.com/article/10.3758/BF03212378); [Glowacki](https://doi.org/10.3389/frvir.2023.1286950)) .

 Semi-corporeal avatar

 The site's main umbrella term for avatars that are present enough for embodiment
 and relation without being fully solid, sealed, or anatomically closed. It covers
 spectral, aura-like, point-cloud, particle, and other partially materialized forms.

 Best used for cross-disciplinary discussion when several body types need to stay in
 scope at once
 ([Richards et al.](https://www.spiedigitallibrary.org/conference-proceedings-of-spie/2177/0000/Virtual-reality-and-virtual-bodies/10.1117/12.173894.full); [dos Anjos and Pereira](https://arxiv.org/abs/2405.02672); [Desnoyers-Stewart et al.](https://doi.org/10.1145/3544549.3585843); [Glowacki](https://doi.org/10.3389/frvir.2023.1286950)) .

 Plasmatic body / plasmatic multitude

 The term plasmatic stresses anti-ossified changeability, while
 plasmatic multitude adds multiplicity, collectivity, and many-part body
 structure. Together they are useful when transformation and reconfiguration matter
 more than stable contour.

 Best used when the body is both mutable and compositionally multiple
 ([Eisenstein](https://seagullbooks.org/products/on-disney); [Geil](https://www.ceeol.com/search/article-detail?id=813411); [Whissel](https://www.dukeupress.edu/spectacular-digital-effects)) .

## Historical and media-theory terms

 Spectral body

 A body rendered as apparition-like, reduced-material, or ghost-adjacent. The term
 is useful when the figure remains bodily but clearly departs from ordinary
 substantial presence.

 Strong when the emphasis is on apparition, projection, or immaterial body image
 ([Richards et al.](https://www.spiedigitallibrary.org/conference-proceedings-of-spie/2177/0000/Virtual-reality-and-virtual-bodies/10.1117/12.173894.full); [Owens](https://shop.tate.org.uk/the-ghost-a-cultural-history-paperback/22503.html)) .

 Animated spirit

 Bukatman's term for a media poetics where liveliness and spirit imagery meet. It is
 useful when animation is being discussed as vitality rather than just as a technical
 effect.

 Best for animation-theory discussions of aliveness, motion, and enchantment
 ([Bukatman](https://books.google.com/books/about/The_Poetics_of_Slumberland.html?id=wi8NYAAACAAJ)) .

 Ghost / apparition

 Historical terms for non-solid presence across phantasmagoria, seance, stage
 illusion, spirit photography, and film. On this site they are kept tied to those
 source traditions rather than used as a loose synonym for anything atmospheric.

 Best when the historical apparatus or cultural register matters explicitly
 ([Owens](https://shop.tate.org.uk/the-ghost-a-cultural-history-paperback/22503.html); [Gunning](https://mediaarthistory.org/refresh/Programmatic%20key%20texts/pdfs/Gunning.pdf); [Natale](https://doi.org/10.1080/17460654.2012.664745)) .

 Non-corporeal lifeform

 A useful franchise term from Star Trek for beings that persist as energy,
 cloud, patterned light, or host-dependent presence rather than as a stable
 corporeal body. It matters here as a mainstream screen index for semi-corporeal
 bodies rather than as a scientific category.

 Best when pointing to popular-media precedents such as the Zetarians, Douwd,
 Onaya, the Pahvans, Ronin, and the Companion
 ([Memory Alpha](https://memory-alpha.fandom.com/wiki/Non-corporeal_lifeform); [Memory Alpha Zetarian](https://memory-alpha.fandom.com/wiki/Zetarian); [Memory Alpha Douwd](https://memory-alpha.fandom.com/wiki/Douwd); [Memory Alpha Onaya](https://memory-alpha.fandom.com/wiki/Onaya); [Memory Alpha Ronin](https://memory-alpha.fandom.com/wiki/Ronin); [Memory Alpha Pahvan](https://memory-alpha.fandom.com/wiki/Pahvan); [Memory Alpha Companion](https://memory-alpha.fandom.com/wiki/Companion)) .

 Ectoplasm

 A historical material metaphor for extruded, mutable, partly formed animated
 matter. It matters because it names a body that is neither pure spirit nor settled
 substance, but something in transition.

 Best when discussing protrusion, materialization, unstable substance, or occult
 media history
 ([Wilson](https://doi.org/10.3366/edinburgh/9780748627691.001.0001)) .

 Thought-form

 A theosophical image term for feeling or thought rendered as visible color, shape,
 vibration, or field. It matters here as a historical vocabulary for non-solid
 bodies that radiate or condense without hard contour.

 Best when the body is being pictured as emanation, aura, or subtle matter
 ([Wilson](https://doi.org/10.3366/edinburgh/9780748627691.001.0001); [Besant and Leadbeater](https://www.gutenberg.org/files/16269/16269-h/16269-h.htm)) .

 Digital multitude

 Whissel's term for CG swarms, crowds, and many-part formations that carry narrative
 and symbolic force. It is the most useful term here when multiplicity becomes the
 body's main visual logic.

 Best when number, collectivity, or swarm-scale meaning is central
 ([Whissel](https://www.dukeupress.edu/spectacular-digital-effects)) .

## XR and avatar-design terms

 Weakly representational body

 Glowacki's term for bodies that suggest a being without fixing it too tightly.
 These forms stay bodily, but they leave room for projection, ambiguity, and altered
 self-other relation.

 Best when discussing bodies that are intentionally under-specified rather than
 fully descriptive
 ([Glowacki](https://doi.org/10.3389/frvir.2023.1286950)) .

 Numadelic body

 Glowacki's category for low-rigidity, boundary-softened body forms that support
 connectedness, imaginative projection, and altered phenomenology without requiring
 conventional anatomical depiction.

 Best when discussing the Isness line and closely related body designs
 ([Glowacki](https://doi.org/10.3389/frvir.2023.1286950); [Glowacki et al.](https://doi.org/10.1038/s41598-022-12637-z)) .

 Aura avatar

 A field-like or envelope-like body that emphasizes proximity, touch metaphor,
 interpersonal boundary, or shared atmosphere rather than fully modeled anatomy.

 Best when the body functions as a relational field
 ([Desnoyers-Stewart et al.](https://doi.org/10.1145/3544549.3585843); [Glowacki](https://doi.org/10.3389/frvir.2023.1286950)) .

 Energetic essence / luminous body

 Terms used for bodies rendered as light-bearing, radiant, or field-like rather than
 as opaque skin and surface. They are most helpful when luminosity is the primary
 carrier of presence.

 Best for the Isness cluster and related light-body work
 ([Glowacki et al.](https://doi.org/10.1038/s41598-022-12637-z); [Glowacki](https://doi.org/10.3389/frvir.2023.1286950)) .

 Point-cloud avatar

 A body rendered as sparse points rather than a continuous surface. It is useful
 when the question is how little surface information is needed for ownership,
 presence, or recognition to hold.

 Best when abstraction is driven by sampling and sparsity
 ([dos Anjos and Pereira](https://arxiv.org/abs/2405.02672); [Desnoyers-Stewart](https://www.medien.ifi.lmu.de/socialHMD/SHMD_19_submissions/SHMD_19_paper_12.pdf)) .

 Particle body

 A body built from particles, emission systems, or fuzzy many-part rendering rather
 than a fixed shell. It is useful when the body needs atmosphere, softness, or
 reactive transformation at the edge.

 Best when materiality is carried by behavior and density rather than by surface
 closure
 ([Reeves](https://doi.org/10.1145/357318.357320); [Desnoyers-Stewart et al. 2020](https://doi.org/10.1162/LEON_a_01925); [Bernal and Maes](https://doi.org/10.1145/3027063.3053207)) .

 Swarm body

 A many-agent body whose unity comes from coordinated movement rather than one
 envelope. It is most helpful when collectivity and motion do more work than
 silhouette.

 Best when bodily identity emerges from distributed behavior
 ([Reynolds](https://doi.org/10.1145/37402.37406); [Whissel](https://www.dukeupress.edu/spectacular-digital-effects)) .

## Perception and interaction terms

 Gestalt coherence

 The grouping logic that lets fragments, sparse points, or soft boundaries still
 resolve into one figure. It is the main perceptual explanation for why weakly
 bounded bodies can still feel body-like.

 Best when explaining readability without full closure
 ([Wagemans et al.](https://doi.org/10.1037/a0029333); [Johansson](https://link.springer.com/article/10.3758/BF03212378)) .

 Common fate

 A motion cue in which many elements read as one entity because they move together.
 It is especially useful for particle, swarm, and point-based bodies.

 Best when bodily unity comes from coordinated motion
 ([Wagemans et al.](https://doi.org/10.1037/a0029333); [Reynolds](https://doi.org/10.1145/37402.37406)) .

 Legible transformation

 A design rule rather than a single theory term: transformation stays believable
 when physical, expressive, or relational cues remain readable as the body changes.

 Best when stylization needs to stay trustworthy rather than arbitrary
 ([Gilland 2009](https://archive.org/details/elemental-magic/page/n2/mode/1up); [Gilland 2012](https://archive.org/details/elemental-magic-volume-ii/mode/1up); [Bernal and Maes](https://doi.org/10.1145/3027063.3053207)) .

 Proteus effect

 The finding that transformed self-representation can feed back into behavior and
 self-perception. It is the basic reason avatar form matters as a condition of
 action rather than just of appearance.

 Best when asking how avatar form changes conduct, affect, or social relation
 ([Yee and Bailenson](https://doi.org/10.1111/j.1468-2958.2007.00299.x)) .

 Pseudohaptics

 Felt touch, stiffness, friction, or resistance induced through vision and
 cross-modal cueing rather than dedicated haptic hardware. It matters because
 abstract bodies can still feel materially persuasive.

 Best when materiality is inferred through behavior and sensory alignment
 ([Lecuyer](https://doi.org/10.1162/pres.18.1.39); [Pusch and Lecuyer](https://doi.org/10.1145/2070481.2070494); [Collins and Kapralos](https://doi.org/10.1080/17458927.2019.1619318); [Desnoyers-Stewart et al.](https://doi.org/10.1145/3544549.3585843)) .

 Coalescence

 A condition in which bodies overlap, merge, or become continuous without
 dissolving into noise. It is especially useful for shared-body and connectedness
 work.

 Best when the body is relationally mixed rather than strictly individual
 ([Glowacki et al.](https://doi.org/10.1038/s41598-022-12637-z); [Glowacki](https://doi.org/10.3389/frvir.2023.1286950); [Desnoyers-Stewart et al. 2020](https://doi.org/10.1162/LEON_a_01925)) .

 Permeability

 The body's capacity to be crossed, shared, buffered, or partially mixed with its
 surroundings. It is one of the clearest working terms for soft boundaries in both
 XR and pain-oriented design.

 Best when the edge of the body is being treated as a variable rather than a given
 ([Glowacki](https://doi.org/10.3389/frvir.2023.1286950); [Desnoyers-Stewart et al.](https://doi.org/10.1145/3544549.3585843)) .

 Boundary precision

 A parameter describing how sharply a body's edge is specified: hard contour, soft
 gradient, or distributed field. It is useful because semi-corporeality becomes a
 controllable variable only when the body's edge can be described and adjusted.

 Best when the body is being treated as an experimental condition rather than a fixed
 shell
 ([Shusterman](https://www.interaction-design.org/literature/book/the-encyclopedia-of-human-computer-interaction-2nd-ed/somaesthetics); [Wagemans et al.](https://doi.org/10.1037/a0029333); [Bullington](https://doi.org/10.1007/978-94-007-6498-9); [Ho et al.](https://doi.org/10.1016/j.jpain.2021.10.009)) .

## Computational morphogenesis terms

 Morphogenetic body

 A body whose form is produced through development-like dynamics: many parts or
 agents follow local rules, respond to signals, and settle into a coherent target
 tendency over time. It is useful when the body is not merely rendered as particles
 but organized as an evolving system.

 Best when the emphasis is on many-agent formation, stateful reconfiguration, and
 learned or rule-based body dynamics
 ([Reeves](https://doi.org/10.1145/357318.357320); [Reynolds](https://doi.org/10.1145/37402.37406); [Pahng et al.](https://arxiv.org/abs/2512.17129)) .

 Target-shape coherence

 The design problem of keeping a many-part body oriented toward a coherent form
 without treating the body as a sealed mesh. In DiffeoMorph this is handled through
 a shape-matching objective; in Plasmatic design it becomes a broader question of
 how a soft body gathers, diffuses, and returns.

 Best when comparing particle, swarm, or point-cloud bodies that need more than
 visual fuzziness to remain legible
 ([Pahng et al.](https://arxiv.org/abs/2512.17129); [hormoz-lab](https://github.com/hormoz-lab/diffeomorph)) .

## Translation and care terms

 Structural specificity

 A measure of how concretely a body is specified. Lower specificity leaves more room
 for projection and ambiguity; higher specificity pushes the body toward fixed
 identification.

 Best when comparing tightly defined avatars to more suggestive body forms
 ([Glowacki](https://doi.org/10.3389/frvir.2023.1286950)) .

 Symbolic rigidity

 A measure of how tightly a form maps onto familiar bodily expectations or social
 priors. Lower rigidity allows a body to stay legible while remaining open-ended in
 meaning.

 Best when asking how much a form dictates interpretation in advance
 ([Glowacki](https://doi.org/10.3389/frvir.2023.1286950)) .

 Liminal design

 A design approach centered on transitions, invitation, threshold states, and return
 rather than static depiction alone. It matters here because semi-corporeal bodies
 often work through staging as much as through appearance.

 Best when the body is introduced as a changing mode of being there
 ([Liedgren et al.](https://doi.org/10.3389/fpsyg.2023.1043170)) .

 Projection and light apparatus

 The staging of bodies through projection, reflection, haze, smoke, beams, screens,
 and hidden optical setup. This term is useful when weakly bounded bodies move from
 avatars into installations, theater, or spatial light environments.

 Best when apparatus and embodiment need to be discussed together
 ([Gunning](https://mediaarthistory.org/refresh/Programmatic%20key%20texts/pdfs/Gunning.pdf); [Science Museum Group](https://collection.sciencemuseumgroup.org.uk/objects/co18245/phantasmagoria-magic-lantern-c-1820); [Royal Collection Trust](https://www.rct.uk/resources/peppers-ghost); [Mitchell et al.](https://doi.org/10.1162/LEON_a_00924)) .

 Transporter dematerialization

 A serial screen grammar in which the body phases into light, particulate shimmer,
 or energy before being reassembled elsewhere. It is useful because it normalizes
 body-to-field conversion as a repeatable visual event rather than a singular ghost
 trick.

 Best when discussing phased transition between corporeal and semi-corporeal states
 in popular media
 ([ASC Staff](https://web.archive.org/web/20260309174521/https://theasc.com/articles/star-trek-50-part-i-original-series-effects)) .

 Body-world meaning

 Bullington's phrase is useful when bodily difficulty is treated as a disturbance in
 relation, situation, and interpretation rather than only as a local malfunction.
 It matters for the pain track because altered body form can then become a tool for
 remapping agency, protection, or threat.

 Best when the body is being redesigned as part of a wider meaning loop
 ([Bullington](https://doi.org/10.1007/978-94-007-6498-9); [Ho et al.](https://doi.org/10.1016/j.jpain.2021.10.009)) .

 Tactile visualization

 Representing felt touch qualities visually so they can be communicated, compared,
 and tracked over time. It is especially useful when a study wants to capture not
 only pain intensity but also location, spread, frequency, and texture-like
 qualities of sensation.

 Best when boundary precision or body sensation needs a reportable measurement bridge
 ([Volpato et al.](https://qri.org/blog/visualizing-tactile-sensations)) .

## Terms to use carefully

 Some words are historically rich but analytically slippery. On this site,
 ghost and spirit are used when the historical source really belongs to
 ghost culture, occult modernism, animation poetics, or apparition media. They are not
 used as blanket substitutes for every diffuse or luminous body
 ([Owens](https://shop.tate.org.uk/the-ghost-a-cultural-history-paperback/22503.html); [Wilson](https://doi.org/10.3366/edinburgh/9780748627691.001.0001); [Bukatman](https://books.google.com/books/about/The_Poetics_of_Slumberland.html?id=wi8NYAAACAAJ)) .

 Quantum is avoided unless a real optical, material, or physics bridge is
 explicitly in view. Otherwise it tends to blur rather than clarify the body-form
 question.

 Diffeomorphic should be used with the same care. DiffeoMorph is the name of a
 specific paper and implementation about differentiable agent-based morphogenesis. On
 this site, morphogenetic is usually the better public term unless the actual
 mathematical property of a diffeomorphism is being discussed
 ([Pahng et al.](https://arxiv.org/abs/2512.17129); [hormoz-lab](https://github.com/hormoz-lab/diffeomorph)) .

 The simplest rule is to choose the term that best explains what the body is doing:
 staying legible, changing boundary, entering relation, or changing material register.

## Sources

 The shared [sources page](https://mesmerprism.com/plasmatic-multitudes/references.html) collects the works cited
 throughout this terminology guide.

 Further reading: [Somaesthetics note](https://mesmerprism.com/plasmatic-multitudes/background/somaesthetics.html).