On each image are used 2 colors
lying opposite each other in the color wheel.

I originally painted three images
of six regularly spaced colors in the color wheel
(1992 and twice in 2000).
But I later added other colors
to a total of 18, so for 9 images.

Already done 5 images,
remaining four color combinations
are still waiting for a suitable topic.
9 × 2 Colors, painting; runaway horse