Garth,
I was actually thinking of your changing of the frame, and the color of it ,as an extension of the lebensraum of the color of the painting itself. This related to the topic about "Optical Red".
I agree that shapes can be too close to one another and in that way block the free expression of the limb , or whatever.
But more interesting is the unintended restriction of a color if it is not allowed to fill its full potential.
In the case of your painting, it could be that the shadows would look too pale if you used a too dark frame, as you mentioned.
The reversed example, how to emphasize a color, or light, is to extend the effect of it beyond its borders. That was my first idea when I saw your post at first.
Allan
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