{{Template:GUI_Object|empty|none|none}}

Has no functionality; used as a container to group child objects.

Can be used as a coordinate-system for instance, making the children relative in position.

Empty is also the default type, which means it's possible to use an object tag devoid of properties:

  <object> 
          ...
  </object> 

This makes for a great generic container, for instance to group Radio-buttons together.

Notice if you give an empty control a size, it will still not block world interaction, i.e. the empty control is inherently ghost. If you need a "glass layer" (a "hollow blocker" or invisible object that stops objects under it from being clicked), it's better to use an Image without a sprite.