def METHOD_NAME(self, reference=None):
    """
    Returns (:py:class:`.Placeable`, :py:class:`.Vector`) tuple where
    the vector points to the center of the placeable, in ``x``, ``y``,
    and ``z``. This can be passed into any :py:class:`.Robot` or
    :py:class:`.Pipette` method ``location`` argument.
    If ``reference`` (a :py:class:`.Placeable`) is provided, the return
    value will be in that placeable's coordinate system.
    :param reference: An optional placeable for the vector to be relative
                      to.
    :returns: A tuple of the placeable and the offset. This can be passed
              into any :py:class:`.Robot` or :py:class:`.Pipette` method
              ``location`` argument.
    """
    pass