
The top right pane (of the smaller window), appears to have a darker middle as if there is a large hole.
Now here is another rendition in the negative which shows that same top right pane with a lighter shade in the middle.
(lighter, because this is a negative)

That said, if you look at both the lower two panes, I think we can see differences in light & dark in both the lower left pane & the lower right pane.
So whether these differences in shade indicate anything certain is hard to say.
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