[ FindVisibilityLevels visibility_levels;
  visibility_levels = 1;
  visibility_ceiling = parent(player);
  while ((parent(visibility_ceiling) ~= 0)
         && (visibility_ceiling hasnt container
             || visibility_ceiling has open
             || visibility_ceiling has transparent))
  {   visibility_ceiling = parent(visibility_ceiling);
      visibility_levels++;
  }      
  return visibility_levels;
];