Sometimes the innermost* central triangle appears to be a window looking through to atmosphere behind (it is in fact a cut-out that reveals the underpainting), but at other times it appears to be a bright opaque triangle superimposed on top of a solid red circle which is in turn on top of a solid print triangle.
I'm guessing the black outline in that space may be what teases the perception, along with the difference in value in the atmosphere colors, even though the atmosphere was "all of a piece" before I brought shapes into the composition.
Atmosphere & Shapes #9 |