The brief becomes the build.

experience "Immersive Gallery" {          // one blueprint — the whole guest story, start to finish
  intent: "A guest walks a responsive gallery that reads how they feel and shapes the room around them"
  spec: "openxp/1.0"
  version: "1.0"
  locale: "en-GB"
  realm: physical

  accessibility {                          // access needs ship inside the experience (R225-R230)
    navigational { wheelchair: true, step.free: true }
    perceptual   { audio.description: true, warning.photosensitive: false }
  }

  touchpoints {

    // Sense the guest
    entry: sensor.beacon    { zone: "entrance" }
    bio:   sensor.biometric {
      type: "heart.rate"
      processing {
        mode: transient                    // read in the moment, never stored
        purpose: "Read excitement in the moment to pace the scene"
        lawful.basis: consent              // consent travels with the data
        classification {
          confidentiality: confidential
          integrity: high
          availability: medium
        }
      }
    }

    // Shape the room
    spatial: output.audio    { zones: 3 }
    ceiling: output.led      { pixels: 2400 }
    lights:  output.lighting { universe: 1 }

    // Name the feelings the room can hold
    warmth: perception.warmth { intent: "welcome", source: lights,  range: [0.0, 1.0] }
    wonder: perception.wonder { intent: "awe",     source: ceiling, range: [0.0, 1.0] }
    calm:   perception.calm   { intent: "reflect", source: spatial, range: [0.0, 1.0] }

    // A human in the loop
    guide: actor.guide { role: "facilitator", intent: "Improvise, but never break the spell" }

    // A mind that adapts within the rules
    curator: agent.deliberative { model: "claude", latency_sla: "5s", fallback: "advisory" }
  }

  journey "visitor" {                       // the emotional shape of one visit: welcome, awe, then stillness
    intent: "Carry one guest along an arc that rises into wonder, then settles into calm"
    initial: arrive

    phase "arrival" {
      arc.phase: "arrival"                  // the room greets them
      moment "welcome" {
        perception.targets { warmth { min: 0.3, max: 0.6, ramp: "gentle" } }
        state arrive {
          on.enter { do: lights.cue("warm_amber_rise") }
          on entry.detect -> immerse { do: output.scene(name: "welcome_glow") }
        }
      }
    }

    phase "immersion" {
      arc.phase: "rising"                   // the room opens up, wonder builds
      moment "the-reveal" {
        perception.targets { wonder { min: 0.6, max: 0.9, ramp: "swell" } }
        state immerse {
          on.enter { do: ceiling.cue("constellation_bloom") }
          on wonder.peak -> reflect { do: output.scene(name: "starfield") }
        }
      }
    }

    phase "reflection" {
      arc.phase: "resolve"                  // the room quiets; the guest keeps the feeling
      moment "stillness" {
        perception.targets { calm { min: 0.5, max: 0.8, ramp: "settle" } }
        state reflect {
          on.enter { do: spatial.cue("low_room_tone") }
          on calm.hold -> farewell { do: lights.cue("soft_fade") }
        }
        state farewell { }
      }
    }
  }

  safety {                                  // guardrails the AI can never cross
    comfort_first {
      when:     "bio.reading > 0.9"          // if a guest is overwhelmed
      ensure:   warmth.reading < 0.6         // the room pulls back
      response: stop
    }
  }
}