A good discussion point. I like anchor points, but I don't strive for them. I more think of an image as a movie or play. There is the protagonist and antagonist then the supporting characters. I guess you could also look at it like music. Symphonies or Rock. In rock there is a lead instrument like guitar, rhythm anchor such as bass that gives fullness and and ability to feel the music and then the vocals and harmonies. The symphony is similar but typically without the vocals.
Both forms of music require each instrument to occupy it's own space in the frequency band with an overlap in the harmonics, etc. If this is not achieved then the music becomes unintelligible, being over crowded as everything occupies the same space.
Photography is the same way to me. It is a song that if recorded wrong or processed wrong will fail till we can isolate and have everything occupy it's own space providing a compliment to the main character of your scene.
That is the way I see a scene it is music in the visible spectrum.
As Ozzy sings "...swallowing colors of the sound I hear..."
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