So....first entry in a while. Just thinking about colors.
The world of B&W/grays is full of wonderful tones that mix and match beautifully. And what does high contrast + grays do for the story? Doesn't it make everything seem to be precisely planned.....each scene is easier to 'read' as our minds are not as confused with too much information. We tend to process only what's important; the picture story flows like a river. That's the moving picture in B&W.
What about natural light? I'm experimenting with grays and blue grays lately. I noticed after a good rain, the sun came out just before sunset. The sky was still mostly gray, but the sunlight glow was a bright yellow. The yellow street light was more vivid than normal. And the greens were saturated--grass, trees, and bushes were technicolor green. A true magic hour.
I had my office painted last year. I had chosen a couple colors but before anything was done, I got a beautiful shade of a cool gray primer on every wall. I almost couldn't paint over it. It was so incredible how the other colors in my office even the wood tones seem to jump out. I lived with that for a day or so and hated to see the gray go away, but it did. Someday I'll go back.