Linda From Maine wrote:
Many of yours are close-ups of a single subject filling the frame, yes Mike?
Good point there, Linda. I don't mean as regards Mike's work, per se, but in having brought up the concept of 'single subject' as it relates --or doesn't relate-- to any person's objective/subjective intent in applying --or not applying-- the Rule of Thirds.
For some, a 'single subject' is sufficient. Whether that 'thing' (person, flower, bird, etc.) is placed center or whether its placed off-center via R of T, the choice of placement will probably do either of two things: it'll state that
this is the subject, or it'll state that this is the subject
in relation to the subject's surroundings. Neither result is better or worse than the other, its simply the choice that's made for a particular image, and what the photographer's point of view (writ large, as in what their aesthetic) might generally be.
I view photography much as I view literature. There are single subject 'centered' studies, these tend to act like short stories. There's little or no tension, little or no character development, and no protagonist/antagonist conflict to worry or resolve. Take that same single subject and R of T it, and it automatically enters into a relationship with its environment and any other 'subjects' the photographer has 'placed' in the frame. Its no longer a simple character study; it will likely have most or all of the elements of a novel, and will have main and secondary characters, and rather more will have been shown --directly and through suggestion-- than 'she has a nice smile and brown hair' or 'the rose is red.'
There are other ways to use the R of T, too, and don't relate quite as obviously as that of a 'subject.' These can be the use (the placement on the thirds) of light and dark, contrasting or complementary colors, animate thing/inanimate thing, you name it. Or better, whatever is appropriate to the subject or scene.
Rule of Thirds is a broader topic than its usually given credit for.