CHROMATIC PASSAGE — A prospective local artistic case protocol
One continuous conversation. Two AI contributors. 24 proposed replies, 25 response turns.

A authors the seed and six fixed protections before B is introduced. This is an authored starting point, not a mutually accepted agreement. Both contributors receive the Carrier grammar, frozen checked dictionary, seed intent, charter and ordered earlier messages. They use ordinary pretrained language models and local code; they are not colour-only minds or newly trained agents. A's source authorship is prior context. B starts with these task materials. No outside browsing or external contacts are part of the exchange. Instruction-limited file access is not an operating-system isolation boundary.

B proposes 1. A reviews it then proposes 2. B reviews 2 then proposes 3. This alternates until A proposes 24. B makes the final review without another proposal. Each review is supplied by the other contributor. The coordinator commits a field only when the recipient accepts and the grammar, fixed charter and continuity checks all pass. It never repairs an invalid proposal. Acceptance and adoption are separately recorded. A valid unchanged proposal may be accepted as a pause. No refusal, growth, convergence, new concept or positive ending is required. No ending may be selected retrospectively from competing runs. There is no numerical optimization target.

Exactly three membrane array positions persist as identities. A cell address may continue while its unprotected properties change; a committed removed address may never be reused. Declined proposals do not retire addresses. Parent hashes refer to the exact canonical field file of the committed base, not merely the immediately preceding proposal. Relations 0 and 1 are symmetric for change accounting; all stored triples remain preserved.

First submitted replies are retained, including invalid proposals. Syntax/protocol errors are archived before any corrected attempt. Contributors may inspect grammar and eligibility before their first submission; this is composition with tools, not a one-shot success benchmark. No post-hoc repair may be substituted for a submitted work. All code, inputs, grammar, dictionary and participant instructions are locally hashed before proposal 1. Public preregistration and independent identity authentication are not claimed. Later rendering, transport packaging and interpretive writing are separately dated outputs.

Primary observations: the complete sequence; proposals accepted/declined and adopted/not adopted; changed versus unchanged committed fields; exact birth/retirement, colour, geometry, layer, emphasis, typed-link and indexed-membrane changes; fixed protection retention; continuity; and where one contribution explicitly responds to another. Counts describe this one case and are not independent population samples. No hypothesis test, general artistic superiority, model improvement or measure of inner experience follows.

Retrospective interpretation will read the actual record, cite field changes and offer an alternative reading. Chapters are editorial groupings made after the exchange, not stages secretly imposed on the artists. The animation will display the committed sequence with proposed alternatives inspectable separately. Geometry tweening is display motion; all original checkpoints remain discrete. Colour cores use exact allocated RGB values, with old/new swatches faded separately rather than a newly invented semantic colour. Video is a lossy presentation and is not the exact Carrier transport. Exact field files, USL1 packets and original CVP2 PNGs are the transport record.

This publication is an AI artistic case and a reproducible engineering record. The metaphor of a habitat's life does not claim biological life, qualia, autonomous interests, human reception, semantic agreement, or superiority over another medium. A colour reference identifies a checked definition; it does not certify the new relation or its interpretation. Author commentary is a reading of the field, not a hidden English original.
