{
  "object_category": "laptop (portable computer)",
  "granularity_level": "medium",
  "segmentation_principle": "Separate the primary hinged display from the fixed chassis, prioritizing kinematic bodies over surface details like individual keys.",
  "articulated_components": [
    "hinged display assembly (screen and integrated hinge)",
    "keyboard (movable relative to base, though typically fixed in this configuration)"
  ],
  "fixed_components": [
    "base chassis (including touchpad, bottom panel, and branding stickers)",
    "power cord attachment port"
  ],
  "sam2_failure_modes": [
    "SAM2 may over-segment individual keyboard keys or merge the screen and keyboard into a single mask, failing to capture the hinge's independent kinematic motion."
  ]
}