{
  "schemaVersion": 1,
  "taskId": "fixed-light-moving-shadow-caster",
  "creationKind": "original-geometric-illustration-and-method",
  "evidenceClass": "method-not-independently-tested",
  "firstFrameFile": "S01-first-frame.png",
  "reviewGuide": {
    "file": "review-guide.svg",
    "role": "authored intended geometry/review illustration; not a model result and not an uploaded last frame"
  },
  "inputCount": 1,
  "sourceType": "fictional-geometric-practice-not-real-product",
  "input": "The original schematic contains a yellow lamp on a fixed stand at frame left, a coral disc hanging from its short sliding stem on a horizontal rail, and a pale receiving wall at frame right. The wall has two faint seams and exactly one darker elliptical shadow. There is clear picture space between disc and wall. light-caster-receiver-roles.json names these authored roles; it does not contain measured optical settings.",
  "anchors": "Keep the lamp stand, rail, two wall seams and camera unchanged. Move only the disc with its original sliding stem a short distance along the rail. The wall shadow is the response, not another solid disc and not a mark glued to the object.",
  "originalPrompt": {
    "en": "Use the supplied original lamp-disc-wall schematic as the first frame. Lock the camera, the yellow lamp and stand, the horizontal guide rail, and the pale wall with its two seams. Move only the original coral disc and its short attached sliding stem a small distance toward frame right along the existing rail, then stop. The disc remains suspended in front of the separate wall and does not touch or stick to it. The original single darker shadow on that wall changes continuously in response to the moving blocker and stays on the receiving wall; after the disc stops, the shadow also holds still. Keep one lamp, one coral disc and one cast shadow. Do not move the light, add another shadow, rotate the wall, make the shadow into a floating solid disc or attach it to a nonexistent floor contact. Preserve the source layout and the visible gap. This is a requested qualitative illustrated cause-and-response sequence, not a calibrated optical simulation.",
    "zh": "使用提供的原创灯—圆片—墙面示意图作为首帧。固定相机、黄色灯及灯架、水平导轨，以及带两条接缝的浅色墙。只让原来的珊瑚色圆片和相连短滑动杆沿已有导轨向画面右侧移动一小段，然后停住。圆片持续悬在独立墙面前方，不接触、不粘住墙。原来墙上的唯一较暗投影随遮光片移动连续变化，并留在受影墙上；圆片停后，影子也安静停住。保持一盏灯、一个珊瑚色圆片和一个投影。不移动光源，不加第二影，不转动墙，不让影子变成漂浮实体黑片，也不把它连到不存在的地面接触点。保持原构图和圆片与墙之间的可见间隔。这是示意因果关系的定性视觉要求，不是标定光学仿真。"
  },
  "steps": {
    "en": [
      "Locate the lamp, suspended disc, empty gap and wall shadow before uploading. A replacement with the object resting on the receiving surface changes the contact assumption and should not be used for this exercise.",
      "Request one small disc movement toward frame right on the existing rail. Keep the lamp in place and exclude relighting, a rotating wall, camera movement or a second occluder.",
      "When a result is available, compare the disc and shadow during the move. The single shadow should respond continuously on the same wall, not leave the receiver as an independent dark object.",
      "After the disc stops, inspect whether its shadow also settles. Judge causal consistency qualitatively; a plausible-looking ellipse is not a calibrated prediction of shadow length, area or brightness."
    ],
    "zh": [
      "上传前找到灯、悬空圆片、间隔和墙上投影。替换图片若让物体接触受影面，就改变了本题的接触前提。",
      "只安排圆片沿原导轨向画面右侧小幅移动。灯固定，去掉重新布光、墙转动、相机运动和第二个遮光物。",
      "以后有结果时，在移动中对照圆片与影子。原单影应在同一墙面连续响应，不能离开受影面变成漂浮黑片。",
      "圆片停住后，再看影子是否也稳定。只作定性因果检查；像样的椭圆不代表影长、面积或亮度已经标定。"
    ]
  },
  "acceptance": {
    "en": [
      "Lamp, stand, rail, wall seams and camera remain fixed.",
      "The same coral disc moves with its original sliding stem; no separate unsupported disc is added.",
      "A visible disc-to-wall spatial gap remains; the disc does not stick to the receiving plane.",
      "Exactly one original shadow responds continuously on the same wall.",
      "The shadow neither turns into a floating solid object nor acquires a second light/shadow source.",
      "Disc and shadow both settle, with their intermediate relationship checked rather than only their final shapes."
    ],
    "zh": [
      "灯、灯架、导轨、墙缝和相机保持固定。",
      "同一圆片随原短滑动杆移动，不多出无支撑圆片。",
      "圆片与墙的空间间隔持续可见，没有粘住受影面。",
      "墙上原有唯一投影连贯响应，并留在同一墙面。",
      "影子不成为漂浮黑色实体，也不新增光源或第二影。",
      "圆片与投影都停稳；检查过中段关系，不只看结尾形状。"
    ]
  },
  "ending": {
    "en": "Retain observations of the starting gap, an intermediate disc-shadow response and the stopped pair. Record directional continuity without inventing a measured shadow displacement.",
    "zh": "保留起始间隔、中间一次圆片—投影响应与最终停稳的观察。记录连续方向，不编造测得的影子位移。"
  },
  "modelGeneration": "not-executed",
  "paidCalls": 0,
  "outputMedia": [],
  "sourceBriefRef": "S14-next-original-task-briefs-20261022-02#fixed-light-moving-shadow-caster",
  "exactTaskSearchVolume": null,
  "extraObservationSources": [
    "light-caster-receiver-roles.json"
  ]
}