rutledge

...and by the way,
the above is usually only true so long as the artist's main point is to show off the tree and/or the scene as a whole. Once the artist begins to shift emphasis to a specific message that is not best communicated by the tree or by 3 equally-weighted elements in a theme, the composition probably has to change again! Shift of emphasis means a shift in the relevant artistic principles (facts).

I don't want to get too far off on tangents, but I believe it's important to maintain the understanding that this is a vast subject. If you are truly interested in this sort of thing, the best thing to do is not to continue grilling me here in an effort to find some chink in the armor, but rather to enroll in a long-term study of artistry. Nothing better. Good luck!

Kind regards,
Andy