{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.head-stand","code":"thing-q500622","url":"https://ver.cy/models/thing/q500622/","name":"head stand","alternateNames":[],"kind":"thing","status":"published","version":"0.1.0-research.1","language":"en","classifiers":{"family":"Thing Registry","category":"Activities and processes","entryKind":"thing","plane":"ACT","domain":["ACT.ACT"],"industry":[],"navPath":"","tags":[],"facets":{}},"whatItIs":"A headstand is an inverted balance in which the crown of the head contacts a supporting surface and, usually together with the hands or forearms, supports the body with the trunk and legs above the head.","purpose":"Enable an agent to recognise a head stand, describe its support and execution, and determine which assessment or supervision context applies.","scope":{"in":["Recognition of head-supported inverted balances","Head, hand and forearm contact configurations","Body configuration and balance during an attempt","Entry, holding and exit phases","External assistance, apparatus and execution setting","Observed outcomes and applicable assessment criteria"],"out":["Handstands and forearm stands without head support","Shoulder stands in which the head is not a supporting base","Head spins and other rotational skills as independent activities","Complete yoga, gymnastics or acrobatics training programmes","Medical diagnosis, individual clearance and injury treatment","Stands or fixtures used to hold manufactured or anatomical heads"],"boundaries":[]},"distinguishingFeatures":["The pelvis is elevated above the head in the defining inverted phase; merely bending down and touching the head to the floor does not establish a head stand.","The head forms part of the supporting base; incidental head contact during a handstand requires separate classification.","Record whether hands, forearms, apparatus or another person share support, rather than treating every head stand as head-only support.","A shoulder-supported inversion is distinguished by its supporting contact configuration, even if the head also touches the surface.","A head-supported balance may occur within a sequence, but a head spin or transient passage through inversion is not automatically a held head stand."],"structure":{"bundles":[{"id":"head-stand-identity","name":"Head stand identity","description":"Defines the activity through inversion and head support while retaining uncertainty about registry intent.","layers":[{"id":"inversion-and-support","name":"Inversion and support","description":"Establishes the physical features required to recognise an instance.","findings":[{"id":"head-supported-inversion","name":"Head-supported inversion","description":"Record evidence that the body reaches an inverted configuration and that the head participates in support.","questions":[{"text":"What evidence establishes that the pelvis is above the head during the candidate head stand?","id":"head-supported-inversion-q01","kind":"definition"},{"text":"Does the head participate in support, or does it merely touch the surface?","id":"head-supported-inversion-q02","kind":"boundary"}]}]},{"id":"practice-specific-naming","name":"Practice-specific naming","description":"Connects the registry label to terms used in the originating practice.","findings":[{"id":"variant-name-mapping","name":"Variant name mapping","description":"Preserve the source's variant name without assuming that yoga, gymnastics and dance terms are interchangeable.","questions":[{"text":"Which practice or source supplies the name used for this head stand?","id":"variant-name-mapping-q01","kind":"provenance"},{"text":"Does that source include assisted, tucked or transitional forms within the same named activity?","id":"variant-name-mapping-q02","kind":"boundary"}]}]}]},{"id":"support-and-body-configuration","name":"Support and body configuration","description":"Describes the supporting base and the arrangement of the inverted body.","layers":[{"id":"contact-and-load","name":"Contact and load","description":"Separates observable contacts from claims about load distribution.","findings":[{"id":"support-base-record","name":"Support base record","description":"Record head, hand and forearm contacts, their relative positions, and the evidence available about their supporting roles.","questions":[{"text":"Which parts of the head and upper limbs contact the supporting surface, and where are they relative to one another?","id":"support-base-record-q01","kind":"measurement"},{"text":"Is load sharing measured, reported or inferred solely from visible contact?","id":"support-base-record-q02","kind":"provenance"}]}]},{"id":"inverted-body-arrangement","name":"Inverted body arrangement","description":"Captures trunk, pelvis and limb positions during the balance.","findings":[{"id":"configuration-through-time","name":"Configuration through time","description":"Describe the held configuration and changes within it without assuming that straight legs define every variant.","questions":[{"text":"What trunk, pelvis and leg configuration is observed during the inverted phase?","id":"configuration-through-time-q01","kind":"measurement"},{"text":"Which configuration changes belong to the declared variant, and which indicate departure from its assessment criteria?","id":"configuration-through-time-q02","kind":"boundary"}]}]}]},{"id":"attempt-and-balance","name":"Attempt and balance","description":"Represents a head stand as an attempt unfolding through entry, holding and exit.","layers":[{"id":"phase-boundaries","name":"Phase boundaries","description":"Separates preparation and transitions from the defining inverted phase.","findings":[{"id":"hold-interval","name":"Hold interval","description":"Record explicit timing boundaries and distinguish an achieved hold from passage through the position.","questions":[{"text":"Which observable events mark the start and end of the head stand hold?","id":"hold-interval-q01","kind":"measurement"},{"text":"Does the applicable practice require a minimum duration to count the attempt, and what source establishes it?","id":"hold-interval-q02","kind":"definition"}]}]},{"id":"balance-and-exit","name":"Balance and exit","description":"Captures maintenance of the inverted position and termination of the attempt.","findings":[{"id":"balance-events-and-termination","name":"Balance events and termination","description":"Record repositioning, new support contacts, assistance and exit events separately from overall success labels.","questions":[{"text":"What repositioning, support changes or assistance occur while the head stand is held?","id":"balance-events-and-termination-q01","kind":"measurement"},{"text":"Does the attempt end through an intended exit, external intervention, loss of balance or an unobserved transition?","id":"balance-events-and-termination-q02","kind":"measurement"}]}]}]},{"id":"execution-context-and-assessment","name":"Execution context and assessment","description":"Links the observed attempt to its setting, assistance and applicable decision criteria.","layers":[{"id":"surface-and-assistance","name":"Surface and assistance","description":"Records environmental supports that affect interpretation of the attempt.","findings":[{"id":"external-support-role","name":"External support role","description":"Distinguish support actually used from nearby equipment or a person available to assist.","questions":[{"text":"What surface, wall, apparatus or person is involved, and during which phases is contact made?","id":"external-support-role-q01","kind":"measurement"},{"text":"Does external support maintain the inversion, assist a transition or remain available without contact?","id":"external-support-role-q02","kind":"boundary"}]}]},{"id":"criteria-and-next-actions","name":"Criteria and next actions","description":"Constrains judgments and recommendations to explicit criteria and available evidence.","findings":[{"id":"assessment-authority","name":"Assessment authority","description":"Link completion and quality judgments to an identified practice standard; do not infer individual suitability from successful inversion.","questions":[{"text":"Which named source or assessor defines completion and execution quality for this head stand variant?","id":"assessment-authority-q01","kind":"provenance"},{"text":"What missing evidence or qualified review is required before an agent can recommend progression or further attempts?","id":"assessment-authority-q02","kind":"action"}]}]}]},{"id":"evidence-and-external-alignment","name":"Evidence and external alignment","description":"What the world already says about this thing, gathered so the model can be checked against it.","layers":[{"id":"reported-evidence","name":"Reported evidence","description":"Findings from the breadth pass, kept separate from the structural claims.","findings":[{"id":"evidence-confidence-notes","name":"Check these first","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these check these first hold for the sense of head stand this model covers, and on what evidence?","id":"evidence-confidence-notes-q01","kind":"provenance"}]},{"id":"evidence-kinds","name":"Kinds and varieties","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these kinds and varieties hold for the sense of head stand this model covers, and on what evidence?","id":"evidence-kinds-q01","kind":"provenance"}]},{"id":"evidence-real-world-use","name":"Real-world use","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these real-world use hold for the sense of head stand this model covers, and on what evidence?","id":"evidence-real-world-use-q01","kind":"provenance"}]},{"id":"evidence-measurements","name":"Typical measurements","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these typical measurements hold for the sense of head stand this model covers, and on what evidence?","id":"evidence-measurements-q01","kind":"provenance"}]},{"id":"evidence-failure-modes-and-hazards","name":"Failure modes and hazards","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these failure modes and hazards hold for the sense of head stand this model covers, and on what evidence?","id":"evidence-failure-modes-and-hazards-q01","kind":"provenance"}]},{"id":"evidence-regional-variation","name":"Regional variation","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these regional variation hold for the sense of head stand this model covers, and on what evidence?","id":"evidence-regional-variation-q01","kind":"provenance"}]},{"id":"evidence-neighbours","name":"Neighbouring kinds and how to tell them apart","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these neighbouring kinds and how to tell them apart hold for the sense of head stand this model covers, and on what evidence?","id":"evidence-neighbours-q01","kind":"provenance"}]}]}]}]},"agentConduct":{"may":["Describe the headstand, its variations and general safety guidance from reliable sources.","Suggest qualified instruction for people who want to learn it."],"mustNot":["Encourage people with neck, eye, blood pressure or other relevant conditions to attempt it without medical advice.","Encourage beginners to practise it unsupervised on hard surfaces or near obstacles.","Present it as a cure for medical conditions."],"requiresHuman":["Advising a person with a known health condition on whether to practise inversions."]},"ethics":{"considerations":["Inversions put load on the neck and can injure people who try them unprepared.","Health claims about poses can mislead people away from medical care."],"affectedParties":["Beginners","People with neck or eye conditions","Children"]},"owners":{"steward":"Nobody owns the posture; instructors answer for the classes they teach.","roles":[],"masterSystems":[]},"relations":[{"target":"Q110147253","type":"parent","note":"registry parent class"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.head-stand","Wikidata: Q500622 (https://www.wikidata.org/wiki/Q500622)"]},"properties":{"applicability":"not-applicable","items":["Practice context: yoga | gymnastics | acrobatics | dance | other | unknown","Supporting contacts: Recorded combination of head, hands, forearms, apparatus and human support","Head contact region: Observed or reported anatomical contact region | unclear | unobserved","Body configuration: Description of pelvis position, trunk orientation and leg arrangement","Execution phase: preparation | entry | inverted hold | exit | interrupted attempt | completed attempt","Hold duration: seconds, with explicitly defined start and end events","External assistance: Links to wall, apparatus or assisting person, with contact and assistance role","Support-load evidence: instrumented measurement | participant report | observer inference | unknown","Attempt outcome: hold observed | entry not achieved | interrupted | balance lost | indeterminate, with exit recorded separately"]},"recognition":{"applicability":"optional","items":["The crown of the head contacts the supporting surface with the trunk positioned above it.","The hands or forearms usually provide additional contact beside the head.","The legs are raised above the trunk or held in a bent variation while the body remains inverted."]},"capabilities":{"applicability":"required","items":["Classify a recorded attempt as a head stand, a neighbouring inversion or an unresolved case.","Compare attempts by support configuration, assistance, body position and hold duration.","Annotate entry, holding, balance loss and exit events in an observation or video.","Link an attempt to the terminology and assessment criteria of its practice context.","Identify missing observations before judging completion or execution quality.","Route requests for technique instruction or individual suitability to an appropriately qualified source."]},"hazards":{"applicability":"required","items":["Loading through the head can place harmful stress on the neck.","Loss of balance can cause falls and injuries to the participant or nearby people.","Inversion may aggravate some existing health conditions and require individual assessment.","An unstable or obstructed practice space increases collision and fall risks."]},"interfaces":{"applicability":"not-applicable","items":[]},"context":{"applicability":"required","items":["The pose occurs in gymnastics, yoga and other balance practices as an inverted body position.","Coaching and movement assessment use it to examine balance, body alignment and the distribution of support."]}},"sources":[{"title":"Wikidata item Q500622: head stand","url":"https://www.wikidata.org/wiki/Q500622","note":"identity and sense of the item"},{"title":"Wikipedia: Headstand","url":"https://en.wikipedia.org/wiki/Headstand","note":"general description of the item"}],"openQuestions":["Does the registry intend head stand as a general physical activity, a particular yoga posture or a specific gymnastics skill?","Which authoritative practice sources define the boundary between a held head stand and a transitional head-supported inversion?","How do relevant practices classify hand-supported, forearm-supported, assisted and head-only variants?","Which observable criteria support reliable judgments of balance and controlled exit across those variants?","Which qualified sources should govern technique, supervision and individual suitability decisions for each execution context?"],"resources":{"spec":"/models/things/publications/thing-q500622/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q500622/spec.json"],"providers":["Codex"],"researchStatus":"unreviewed","generatedAt":"2026-09-12T10:12:34Z","builder":"tools/build_cards.py@1.0.0"},"completeness":{"sections":{"classifiers":"filled","whatItIs":"filled","purpose":"filled","distinguishingFeatures":"filled","structure":"filled","agentConduct":"filled","ethics":"filled","owners":"filled","relations":"filled","interaction.identity":"filled","interaction.properties":"not-applicable","interaction.recognition":"filled","interaction.capabilities":"filled","interaction.hazards":"filled","interaction.interfaces":"not-applicable","interaction.context":"filled","sources":"filled"},"notes":{"_gate":"Published through the thing publication gate 1.0 on 2026-10-07T10:10:31+00:00: completeness 1.00; sense: Wikidata description; 2 live sources; review by codex: pass","interaction.properties":"Plane ACT: no invented physical properties.","interaction.interfaces":"No universal standard or regulation applies to the pose itself independently of its sporting, instructional or clinical context."},"score":1.0}}