Upgrade the language of concept to interface / brush stroke
. Normally we are describing a shape with color and value, we can also use higher concept, it is more abstract, but bundle with more complex factor into a brush stroke.
. The dark side include complementary color purple/yellow and edge of block, to describe more information is this area. So, we don't just copy the grey area of dark, and lift up the lightness in dark area.
. This could take a bigger area to enhance the feeling of color, make it more stronger impact, creating dialog between viewers and the painting.
. We are using the concept, and it is more complex than just color/value/edge.