{ "vercy": "1.0-draft", "publication": { "status": "research-draft", "adjudicationStatus": "unreviewed", "publishableCanonical": false, "generatedAt": "2026-09-14T01:27:59Z", "providers": [ "Claude" ], "breadth": "written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify", "pass": 2, "wave": 4, "engine": "claude", "enrichment": { "pass": 3, "engine": "claude", "producedAt": "2026-10-06T11:00:00Z", "ingestedAt": "2026-10-06T07:45:57+00:00", "fields": [ "agent_conduct", "ethics", "owners" ] }, "revisions": [ { "at": "2026-10-06T22:59:01+00:00", "engine": "codex", "fields": [ "agent_conduct", "definition", "distinguishing_features", "ethics", "failure_modes_and_hazards", "owners", "purpose", "visual_identification" ], "answering_review": "1651ed3616d1e851ba7a4511f57e016babacc19c62eccdfd127b7ecf071cfc30" } ], "gate": { "passed": true, "version": "1.0", "at": "2026-10-07T10:10:32+00:00", "evidence": [ "completeness 1.00", "sense: Wikidata description", "2 live sources", "review by codex: pass" ] } }, "metaModel": { "id": "THING-Q780777", "registryId": "vr.tr.shell-q780777", "name": "shell", "version": "0.2.0-wave.4", "entryKind": "thing", "family": "Thing Registry", "domain": [ "PHY.BLT" ], "status": "research-draft" }, "canonicalUrl": "https://ver.cy/models/thing/q780777/", "model": { "registry_id": "vr.tr.shell-q780777", "name": "shell", "purpose": "Let an agent explain theater shells, their acoustic role, fixed and movable forms, and venue safety requirements, and distinguish them from thin load-bearing shell structures and other senses of shell.", "definition": "An enclosure or arrangement of reflective surfaces around and above a theater stage, used to direct sound toward the audience and help performers hear one another, especially during unamplified musical performances; a theater shell can be fixed or movable.", "what_it_is_for": "Spanning large spaces efficiently with thin curved surfaces.", "affordances": [ "explain forms and behaviour", "relay materials", "relay notable designers", "relay buckling and construction issues" ], "distinguishing_features": [ "Reflective surfaces surround or overhang the performance area.", "The shell supports sound projection toward the audience.", "The shell helps performers hear one another.", "Components can be fixed or movable." ], "appearance": "Thin curved roofs such as domes, saddles and wave-like concrete canopies.", "visual_identification": [ "Reflective panels or an enclosure appear behind and beside a theater stage.", "Overhead reflective panels may form part of the shell.", "Movable shells may include freestanding towers or panel assemblies.", "Appearance alone does not establish acoustic performance or safe installation." ], "physical_properties": [ { "quantity": "Zeiss-Dywidag planetarium shell", "typical_range": "1920s", "unit": "note", "note": "Jena, early thin concrete shell" }, { "quantity": "Los Manantiales restaurant", "typical_range": "1958", "unit": "year", "note": "Felix Candela" }, { "quantity": "typical thin concrete shell thickness", "typical_range": "a few centimetres", "unit": "note", "note": "varies" } ], "families_and_kinds": [ "domes", "barrel vaults", "hyperbolic paraboloids", "free-form and gridshells" ], "related_models": [ { "relation": "is a kind of", "target": "built structure", "why": "in registry terms" }, { "relation": "includes", "target": "dome", "why": "" }, { "relation": "is contrasted with", "target": "tensile structure", "why": "" }, { "relation": "is contrasted with", "target": "plate (structure)", "why": "" } ], "identifiers": [], "standards_and_regulation": [ "Eurocode and ACI design codes", "IASS recommendations for shell design" ], "failure_modes_and_hazards": [ "Unsecured or damaged components can fall or overturn.", "Moving or suspended components can create collision and crushing hazards.", "Unsuitable configurations can impair acoustic clarity and performer audibility.", "Shell components can obstruct stage access or emergency routes." ], "in_scope": [], "out_of_scope": [], "characteristics": [], "agent_conduct": { "may": [ "Explain the acoustic purpose and common forms of theater shells.", "Report visible damage, unsecured components or obstructed routes to venue staff.", "Compare documented shell configurations for an authorized venue task while stating assumptions." ], "must_not": [ "Approve installation, suspension or modification without qualified review.", "Operate movable or suspended components without authorization and appropriate safeguards.", "Treat an acoustic shell as a load-bearing building shell.", "Ignore damaged components or blocked emergency routes." ], "requires_human": [ "Qualified venue personnel must approve shell movement and configuration changes.", "Qualified specialists must approve repairs, suspension changes and structural alterations.", "Venue management must decide whether an unsafe performance area can reopen." ] }, "ethics": { "considerations": [ "Shell safety affects performers, stage crews and audiences.", "Acoustic quality affects performers' ability to hear one another and audiences' access to a performance." ], "affected_parties": [ "Performers depend on the shell's acoustic and physical safety.", "Stage crews handle and maintain shell components.", "Audiences experience the resulting sound and share venue safety risks.", "Venue owners and operators are responsible for safe facilities." ] }, "owners": { "steward": "The theater owner or operator, supported by qualified stage, acoustic and engineering personnel.", "master_systems": [ "Venue asset and inspection records document the shell.", "Approved venue configuration records describe permitted arrangements." ] } }, "sources": [ { "id": "wikidata", "title": "Wikidata item Q780777: shell", "url": "https://www.wikidata.org/wiki/Q780777", "url_status": "live", "what_it_supports": "identity and sense of the item", "checked_by": "wikidata-api" }, { "id": "wikipedia-en", "title": "Wikipedia: Shell (theater)", "url": "https://en.wikipedia.org/wiki/Shell_%28theater%29", "url_status": "live", "what_it_supports": "general description of the item", "checked_by": "wikidata-api sitelink" } ], "structure": { "bundles": [ { "id": "understand", "name": "Understand", "description": "What a shell structure is.", "rationale": "Definition.", "layers": [ { "id": "definition", "name": "Definition", "description": "Definition.", "findings": [ { "id": "definition-finding", "name": "Definition", "description": "Definition.", "questions": [ { "text": "What is a shell structure, and how does it differ from plates, frames, membranes and tensile structures?", "kind": "definition" }, { "text": "Is a concrete roof showing cracks or sagging, in which case keep clear and contact a structural engineer or building authority?", "kind": "boundary" } ] } ] }, { "id": "forms", "name": "Forms", "description": "Forms.", "findings": [ { "id": "forms-finding", "name": "Forms", "description": "Forms.", "questions": [ { "text": "What are domes, barrel vaults, hyperbolic paraboloids and gridshells?", "kind": "definition" }, { "text": "Which entry fits the specific form?", "kind": "action" } ] } ] } ] }, { "id": "engineering", "name": "Engineering", "description": "Behaviour.", "rationale": "Science.", "layers": [ { "id": "membrane", "name": "Membrane action", "description": "Membrane action.", "findings": [ { "id": "membrane-finding", "name": "Membrane action", "description": "Membrane action.", "questions": [ { "text": "How do shells carry loads through in-plane forces?", "kind": "provenance" }, { "text": "Which references are standard?", "kind": "provenance" } ] } ] }, { "id": "buckling", "name": "Buckling", "description": "Buckling.", "findings": [ { "id": "buckling-finding", "name": "Buckling", "description": "Buckling.", "questions": [ { "text": "Why are thin shells sensitive to buckling and imperfections?", "kind": "provenance" }, { "text": "Which sources are cited?", "kind": "provenance" } ] } ] } ] }, { "id": "designers", "name": "Designers", "description": "Designers.", "rationale": "Sources.", "layers": [ { "id": "candela", "name": "Candela", "description": "Felix Candela.", "findings": [ { "id": "candela-finding", "name": "Candela", "description": "Candela.", "questions": [ { "text": "How did Felix Candela build hyperbolic paraboloid shells?", "kind": "provenance" }, { "text": "Which entry fits Felix Candela?", "kind": "action" } ] } ] }, { "id": "isler", "name": "Isler", "description": "Heinz Isler.", "findings": [ { "id": "isler-finding", "name": "Isler", "description": "Isler.", "questions": [ { "text": "How did Heinz Isler use hanging models to find shell forms?", "kind": "provenance" }, { "text": "Is the information accurate?", "kind": "boundary" } ] } ] } ] }, { "id": "context", "name": "Context", "description": "Revival.", "rationale": "Attribution.", "layers": [ { "id": "decline", "name": "Decline", "description": "Decline after 1970s.", "findings": [ { "id": "decline-finding", "name": "Decline", "description": "Decline.", "questions": [ { "text": "Why did thin concrete shells become less common, as engineers explain?", "kind": "provenance" }, { "text": "Is the presentation neutral and attributed?", "kind": "boundary" } ] } ] }, { "id": "digital", "name": "Digital", "description": "Digital fabrication.", "findings": [ { "id": "digital-finding", "name": "Digital", "description": "Digital.", "questions": [ { "text": "How are digital design and flexible formwork reviving shells?", "kind": "provenance" }, { "text": "Is the information current?", "kind": "boundary" } ] } ] } ] } ] }, "openQuestions": [ "Should gridshells be a separate entry?", "How should notable shells be linked as instances?", "Should digital fabrication of shells be documented?" ], "statistics": { "bundles": 4, "layers": 8, "findings": 8, "questions": 16 } }