code: def show(collector, **kwargs):
      
      configuration = collector.configuration
      flat = configuration.get("harpoon.flat", False)
      only_pushable = configuration.get("harpoon.only_pushable", False)
  
      for index, layer in enumerate(Builder().layered(configuration["images"], only_pushable=only_pushable)):
          if flat:
              for _, image in layer:
                  print(image.image_name)
          else:
              print("Layer {0}".format(index))
              for _, image in layer:
                  print("    {0}".format(image.display_line()))
              print("")
docs: Show what images we have