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+Deprecation of axes collision
+-----------------------------
+
+Adding an axes instance to a figure by using the same arguments as for
+a previous axes instance currently reuses the earlier instance.  This
+behavior has been deprecated in Matplotlib 2.1. In a future version, a
+*new* instance will always be created and returned.  Meanwhile, in such
+a situation, a deprecation warning is raised by
+:class:`~matplotlib.figure.AxesStack`.
+
+This warning can be suppressed, and the future behavior ensured, by passing
+a *unique* label to each axes instance.  See the docstring of
+:meth:`~matplotlib.figure.Figure.add_axes` for more information.
+
+Additional details on the rationale behind this deprecation can be found
+in :issue:`7377` and :issue:`9024`.