[C3 HL-020] Compose layered spatial poetry and reversible legibility #30

Outcome

Investigate seeing versus reading while retaining a recoverable source.

Placement and activation

• Circle: C3 — Composition studio and governed generative experiments
• System responsibilities: Product / Assurance
• Capability coverage: 01 Core Domain / Proprietary Engine; 02 Product Applications & Interfaces; 08 Quality, Testing & Evaluation
• Planning status: C1 measured-gap instrument verified/deployed; C3 layers and reversible-legibility work remain planned.
• Activation: Optional expansion after core acceptance and a demonstrated authoring need
• Parent epic: [EPIC C3] Composition studio and governed generative experiments #6; master roadmap: [MASTER EPIC] Hole-loop: concentric evolution within Persona / Visual Form Canon #2.

Dependencies

C1 spatial instrument: uses verified source/renderer/reading primitives #17/#19 and is already mechanically complete in #56.

C3 layered/reversible compositions: require selected source identities from #12, the relevant minimal parameter/patch contract from #28 and a defined composition question. #29 contributes color/geometry findings only when the selected layer actually uses them; completion of all color experiments is not required.

Acceptance evidence

• Build transparent text planes using DOM/SVG layers first; support separation, order, orientation, and replayable manipulation without requiring full 3D.
• Create linear, branching, and cyclic realizations of one approved source, with whitespace functioning as pause or passage.
• Add an explicitly invented reversible glyph mapping with a recoverable source; never label synthetic marks as authentic writing in an existing language.
• Record at least two contrasting realizations, mapping/version and event sequence, an accessible source reading, and the artist selection.
• Introduce real multilingual/RTL corpora only with suitable source rights, shaping, reading expertise, and review; use a need gate for richer 3D.

Artistic experiment

Schendel informs transparent linguistic material; Xu Bing informs the distinction between visual writing and decipherability; concrete poetry informs spatial syntax.

Completion and scope

Attach the actual artifact or commit, relevant verification, limitations, and an artist decision where a composition changes. This issue plans authorized work; creation does not claim implementation or deployment. Preserve independent work/source identities and private source boundaries. Repository creation requires the extraction evidence in HL-004 #13 and HL-045 #14.

Completed baseline and remaining scope

The C1 space instrument preserves all 378 phrase identities in a 42×9 row-major field. Its variant shifts columns five through nine by exactly one measured baseline phrase advance; reset restores the continuous field. Desktop/mobile viewport evidence and fit/detail/Reading view are in #56/#20.

Transparent planes, branching/cyclic realizations, reversible invented glyphs and any multilingual/RTL or 3D work in the checklist above remain planned. The gap's perceived passage/separation is an agent interpretation awaiting artist review. A narrow fit is a texture; verify usable detail/source-reading access before adopting further layers.