In the thread titled "Response to positive critiques and comments...." user
St3v3M pointed out that there are multiple "types" of critiques. He split them into technical and feelings. I followed that with amplification,
http://www.uglyhedgehog.com/t-254416-2.html#4283254User
mcveed requested something more to explain the meaning of it all,
http://www.uglyhedgehog.com/t-254416-2.html#4285510and suggested a starting point would be if I explained what this statement is about:
"An image is divided into compositional parts as symbols, much the same as a written paragraph has sentences and words that are symbols. The order they are in, which symbols are more dominant and which are subordinate in relation to the symbol that is the subject as well as to each other, can all be described in scientific terms and by the technologies that are used to order them."
I felt that it would be better served by a separate thread.
For a little background, to get the right mind set, imagine a person who is born deaf and never hears a spoken word. Rather than learn to speak, and as a result "hear" themselves think by emulating sounds in their mind, they learn to see like everyone else, but more than others they learn to "see" themselves thinking, by emulating vision in their mind.
People who can hear sounds use different sounds as symbols to mean things. People who cannot hear cannot do that, but instead they use visual symbols much more than others. Both will learn to read and write using letters and words, which are visual symbols, but of course the hearing person relates them to the sounds of speech and the non-hearing person relates them to other visual symbols.
Photography is communications using visual symbols. Just as with written text, where letters and other marks are used, sometimes alone and more often grouped into words, then phrases, sentences, paragraphs, etc, visual symbols also start with base elements and grow as they are combined. Hence any visually distinct component of an image, starting with a single pixel, is a unique symbol, and collected groups are like words (a gradient, an outline, and so on). Each component that is distinct, even if made up of other distinct components, is a symbol.
In a visual communications we often want some parts to be the most dominant: the symbol a viewers eyes focus on most often. Other symbols are less dominant, and might be used either to provide context for the more dominant symbol, or to lead the viewers eyes to the dominant symbol. We make symbols that are too distractive less so by making them subordinate (darker, more blurred, etc) to other symbols.
Each symbol affects the viewer, and the emotion it invokes compared to that of other symbols, is what makes composition an art that photographers use to communicate. Consider the difference in symbols as used by a "straight photographer" as opposed to one who likes abstractions. One is an effort at reproducing detail in a symbol, the other at producing an emotion with the relationship between symbols rather than the detail.
And a wild example is a Cubist painting! Symbols are usually not subject specific, but "universal". A coffee cup doesn't necessarily look exactly like any one coffee cup, but is painted to remind the viewer of every possible type of coffee cup. And Picasso once put an eye on a woman's shoulder rather than on her head, which lead to the question of why do that? He said that eye was important, and nobody was going to notice it next to her nose and the other eye; so because it was an important symbol he placed it where it would be noticed!