Re: [Matplotlib-users] why does transform=None cause a patch not to be shown?

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The key thing to know about normal Artists is that they can have *just
one*transform (to take an artist's coordinates into pixel space), so
whilst
there is no error when you do it, it is not possible to add the same artist
to multiple Axes and have the desired effect.

To answer your question, try creating two Rectangles and adding one to each
of your Axes.

HTH