docs: revise design + roadmap for single pano projector
Operator decision (2026-06-04): single panoramic projector spanning the three walls showing the real selected video (nature-video focus), replacing four projectors + a procedural side-wall renderer. - Design spec: revision banner; updated §1, §6 (one pano projector), §7 (procedural side walls REMOVED), §10 layout, §12 open questions. - ROADMAP: sub-project 5 marked Dropped; diagram + dependency order updated; §3 player drives one pano output; cross-cutting decisions reconciled. - Sub-project-2 spec: follow-up note updated to past tense (design spec done). dominant_color's only consumer was the side walls, so it stays optional/opt-in in the sub-project-2 tooling (already specced). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Ben Stull
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**Status:** Approved design (pre-implementation)
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**Repo:** `human-experience-filter-art`
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> **Revision — 2026-06-04 (display architecture):** the display moved from *four
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> projectors (one per wall) + a procedural side-wall renderer* to a **single
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> panoramic projector spanning the three walls the viewer faces, showing the real
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> selected video** (launch content focus: **nature video**). This supersedes the
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> original §6 (four projectors) and **removes §7 (procedural side walls)**, and
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> reshapes the roadmap's sub-project 3 (player drives one pano output) and
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> sub-project 5 (procedural side walls — **dropped**). Affected sections below are
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> updated in place and marked. The coordinate model (§2), selection (§3), and
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> catalog (§4) are unchanged.
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---
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## 1. What this is
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A single-viewer immersive art installation. One person sits in a chair at the
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center of a small room with four walls, each fronted by a projector. A DJ-style
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control panel lets them "tune" their experience along a small set of felt axes;
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the system finds the public-domain media nearest that tuning and plays it. The
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piece is an *experience filter*: the viewer dials in how they want to feel and
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A single-viewer immersive art installation. One person sits in a chair in a small
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room; a **single panoramic projector wraps the real selected video across the
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three walls they face**. A DJ-style control panel lets them "tune" their
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experience along a small set of felt axes; the system finds the public-domain
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media nearest that tuning and plays it (launch content focus: **nature video**).
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The piece is an *experience filter*: the viewer dials in how they want to feel and
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think, and the room answers with found human artifacts that match.
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Design constraints that shaped everything below:
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@@ -160,24 +171,37 @@ cannot decode HD video or drive projectors.
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- **Raspberry Pi 5 (or small mini-PC) — brain + player.** Holds the catalog,
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reads the Arduino's serial stream, runs the selection algorithm, and plays
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media. **The hard drive plugs into the Pi**, not the Arduino.
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- **Projectors.** The Pi drives the **primary** wall (the wall the viewer faces)
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with real content. The three **side walls** show procedural ambient (§7),
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driven from the same Pi's additional outputs or a second cheap Pi.
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- **Projector (single, panoramic).** *Revised 2026-06-04.* The Pi drives **one
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panoramic projector that spans the three walls the viewer faces**, showing the
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real selected video across the whole field. There is no longer a primary/side
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split and no procedural side-wall renderer (the former §7). This both simplifies
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the hardware (one output, one projector) and removes the need to *compute*
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`dominant_color` for ambient walls.
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Parts delta vs. the original sketch: add a ~$80 Pi; everything else
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(Arduino, knobs, hard drive, projectors) stays.
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Parts delta vs. the original sketch: add a ~$80 Pi and use a single panoramic
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(ultra-wide / short-throw) projector instead of four; everything else (Arduino,
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knobs, hard drive) stays.
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---
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## 7. Procedural side walls
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## 7. ~~Procedural side walls~~ — REMOVED (2026-06-04)
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The three non-primary walls render a slow gradient / color wash:
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**Superseded by the §6 single-panoramic-projector revision.** The three walls the
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viewer faces now show the **real** selected video (the pano projector spans them),
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so there is no separate procedural ambient renderer. The mood axis is felt through
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the chosen content itself rather than a synthetic side-wall wash.
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- **Hue** comes from the playing piece's `dominant_color`.
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- **Brightness** tracks the Dark / Light knobs.
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Consequences:
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This costs near-zero storage and makes the mood axis physically felt in
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peripheral vision. In `None` mode the side walls also fade to black.
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- **Sub-project 5 (procedural side walls) is dropped** from the roadmap.
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- `dominant_color` loses its only consumer; computing it becomes **optional /
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opt-in** in the ingest tooling (sub-project 2 spec §5.2) rather than a required
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mechanical tag. The field stays in the catalog schema (unused-but-harmless,
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default `""`) for a possible future ambient/lighting use.
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> *Original intent (for the record): the three non-primary walls rendered a slow
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> color wash — hue from the playing piece's `dominant_color`, brightness from the
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> Dark/Light knobs — to make the mood axis felt in peripheral vision.*
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---
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@@ -218,14 +242,18 @@ defensible.
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## 10. Repo layout
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```
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hef/ shared library: catalog model + selection (sub-project 1, built)
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catalog/ the tagged content catalog (JSONL)
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player/ selection algorithm + media player (runs on the Pi)
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player/ media player driving the single panoramic projector (runs on the Pi)
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firmware/ Arduino sketch (reads knobs/selector → USB serial)
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sidewalls/ procedural ambient renderer
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tools/ sourcing/ingest, dominant-color, license checker, review tool
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tools/ sourcing/ingest, mechanical tagging, review tool (sub-project 2)
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docs/ this spec + operator/build guide
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```
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*(Revised 2026-06-04: `sidewalls/` removed with §7; the selection algorithm
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shipped in the shared `hef/` package, not under `player/`, since the tools import
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it too — see the sub-project-1 plan.)*
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---
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## 11. Explicitly out of scope (YAGNI)
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@@ -240,9 +268,13 @@ docs/ this spec + operator/build guide
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## 12. Open implementation questions (for the plan, not blockers)
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- Player stack on the Pi (e.g. mpv/ffmpeg-based vs. a custom renderer) and how
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crossfades are handled.
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- Player stack on the Pi (e.g. mpv/ffmpeg-based vs. a custom renderer), how
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crossfades are handled, and how a single wide/panoramic output is driven (one
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ultra-wide surface vs. spanned displays).
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- Exact serial protocol/framing between Arduino and Pi.
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- Whether side walls run on the primary Pi's extra outputs or a second Pi.
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- Ingest tooling language and where the per-archive downloaders live.
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- Whether the player hard-restricts to `approved` records.
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- ~~Whether side walls run on the primary Pi's extra outputs or a second Pi~~ —
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resolved: no procedural side walls (§7 removed).
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- ~~Ingest tooling language and where the per-archive downloaders live~~ —
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resolved by the sub-project-2 spec: Python under `tools/`, per-archive fetchers
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in `tools/ingest/`.
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@@ -538,11 +538,11 @@ needed for the done-criteria.
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decision to use a **single panoramic projector spanning all three walls, showing
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real nature video**, supersedes the design spec's §6 (four projectors) / §7
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(procedural side-wall renderer) and reshapes sub-projects **3** (player drives one
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pano output, not primary + side feed) and **5** (procedural side walls likely
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dropped). The design spec
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(`2026-06-04-human-experience-filter-design.md`) and ROADMAP should be updated to
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reflect this in a separate pass; it is **out of scope for the sub-project-2 spec**,
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whose only affected element is the now-optional `dominant_color` (§5.2).
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pano output, not primary + side feed) and **5** (procedural side walls
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**dropped**). The design spec
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(`2026-06-04-human-experience-filter-design.md` §6/§7) and ROADMAP were updated
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this session to reflect this. The only element affecting the sub-project-2 spec
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itself is the now-optional `dominant_color` (§5.2).
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---
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