{
  "graph_id": "Instability_Series/ball_drop_stack_collapse",
  "series": "Instability_Series",
  "scene": "ball_drop_stack_collapse",
  "source": {
    "metadata_json": "ball_drop_stack_collapse.json",
    "frame_count": 120,
    "fps": 24
  },
  "participant_registry": [
    {
      "participant_id": "ball",
      "canonical_name": "blue falling ball",
      "metadata_keys": [
        "Ball"
      ],
      "participant_type": "dynamic_object",
      "visual_reference": "the blue ball descending from above the wooden stack"
    },
    {
      "participant_id": "stack",
      "canonical_name": "wooden plank stack",
      "metadata_keys": [
        "Block_0_0",
        "Block_0_1",
        "Block_1_0",
        "Block_1_1",
        "Block_2_0",
        "Block_2_1",
        "Block_3_0",
        "Block_3_1",
        "Block_4_0",
        "Block_4_1",
        "Block_5_0",
        "Block_5_1"
      ],
      "participant_type": "dynamic_object_group",
      "visual_reference": "the compact reddish stack near the center-left"
    }
  ],
  "events": [
    {
      "event_id": "e01",
      "canonical_description": "The blue ball descends toward the upper-right part of the wooden stack.",
      "participants": [
        "ball"
      ],
      "event_type": "falling",
      "cascade_role": "trigger",
      "temporal_stage": 1,
      "observability": "visible_across_adjacent_frames"
    },
    {
      "event_id": "e02",
      "canonical_description": "The ball strikes the upper-right planks of the stack.",
      "participants": [
        "ball",
        "stack"
      ],
      "event_type": "contact_collision",
      "cascade_role": "mediator",
      "temporal_stage": 2,
      "observability": "directly_visible"
    },
    {
      "event_id": "e03",
      "canonical_description": "Several upper planks are ejected, rotating upward and outward while the lower stack stays partly standing.",
      "participants": [
        "stack"
      ],
      "event_type": "support_loss",
      "cascade_role": "outcome",
      "temporal_stage": 3,
      "observability": "visible_across_adjacent_frames"
    },
    {
      "event_id": "e04",
      "canonical_description": "The deflected ball lands on the floor to the right as the loose planks fall around the stack.",
      "participants": [
        "ball",
        "stack"
      ],
      "event_type": "falling",
      "cascade_role": "outcome",
      "temporal_stage": 4,
      "observability": "visible_across_adjacent_frames"
    },
    {
      "event_id": "e05",
      "canonical_description": "The ball and scattered planks settle around a partially collapsed central stack.",
      "participants": [
        "ball",
        "stack"
      ],
      "event_type": "stabilization",
      "cascade_role": "terminal_state",
      "temporal_stage": 5,
      "observability": "visible_across_adjacent_frames"
    }
  ],
  "causal_edges": [
    {
      "edge_id": "c01",
      "source": "e01",
      "target": "e02",
      "relation": "leads_to"
    },
    {
      "edge_id": "c02",
      "source": "e02",
      "target": "e03",
      "relation": "leads_to"
    },
    {
      "edge_id": "c03",
      "source": "e03",
      "target": "e04",
      "relation": "leads_to"
    },
    {
      "edge_id": "c04",
      "source": "e04",
      "target": "e05",
      "relation": "leads_to"
    }
  ]
}