Richard,
I'm not exactly sure what you're getting at here, but here are a few more ramblings on the subject.
Cools recede; warms advance. Thinly painted, transparent colors recede; thickly painted, opaque colors advance. Textured paint also advances. Soft edges recede; sharp edges advance.
Successive layers of transparent color create a luminosity in skin. This is a good reason to investigate the use of mediums, by the way. This transparency creates a different effect from the luminosity created by alla prima painting, which relies more on color temperature shifts and edge control to advance and recede forms.
Overlapping forms gives the illusion of depth.
Desaturating, greying and lightening colors in background forms gives the illusion of distance and atmospheric perspective. Saturated, intense colors advance the form.
There are a lot more of these maxims and I hope other artists will add to them in this post.
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