The different sized circles shift in and out of focus, creating a sense of atmospheric depth. (nationalgalleries.org)
They are also aerial in the sense of being all surface and no depth, or at most a reluctant atmospheric depth. (branchron.com)
Malone writes: «Each image is built of a dominant color, yet within each color there are subtle variations that maintain a shallow atmospheric depth — not enough to sink the color into a distracting illusion, but more than enough to activate its magically ambiguous relationship to the picture plane. (painters-table.com)