Back to the dots again I'm afraid.



Most importantly though, the answer is not in the words that go with the examples but in seeing the difference in the examples themselves.
"Thirds" or "the Rule of Thirds" (The ROT), is mis-understood and overused. What is it?
We see by division. If you apply the rectangle to contain your image you supply a grid which we naturally sub-divide into
equal segments and use much as a ruler to measure scale and distance. Height, for instance, is a measure of the height of the subject compared to the height of the frame. Distance is how high in the frame the object is placed, etc. Compare these two crops:
Already we've diminished the importance of the vertical thirds by attaching something of higher significance to height in the frame.
Because we see equal divisions so well we can easily recognise when the image is divided into thirds. But does it really attach any other significance other than the logic photographers seek to impose?
No. It is simply an imaginary line that is twice as far from one edge as it is the other, (notice we reference it as it's distance from the frame).
As for the intersections in thirds, they are all off-centre and
on the diagonals, see my previous post that demonstrates the visibility of diagonals in the frame.
Here are some dots


:
Thirds, when you provide the whole grid you can see the rhythm and pulse of it, like an equal beat of a drum.
See what happens when we displace that rhythm from the frame:
We see the rhythm in the dots but not in the whole image, it becomes unbalanced and disconnected to the frame.
See what happens when we just place abitrary points on an imaginary line (horizon on thirds?):
There is no rhythm because you've not defined any, you only have one line.
See what happens when we define enough of the beats so you can see the rhythm:
We now see rhythm and shape because there are enough points on the grid to define it, we see a relationship between the dots. But is there a better way?
Here we have rhythm and shape that's not defined by thirds, because they are all the same distance from the frame they have a relationship and you see them as a pattern rather than disconnected dots (remember thirds is a direct reference to the dots position from the frame). Compare this to the dots in a line.
Now ask yourself if placing the horizon on thirds really has all that much significance?
The answer is contained in many of these patterns. Just as my previous patterns showed the importance of centre lines and diagonals in balance, so in these dots can you see the importance of how objects relate to the frame. Thirds is just a symmetrical pattern where the image is divided by three, in the example in the previous post we see the pattern when it is divided by two. And the last one shows you can attach a relationship between objects at the top and bottom of your image (horizon and foreground?) simply by how far you place them from the frame.
And we've just looked at B&W dots. Rhythm also exists between blocks of colour and contrast. Michael Freeman's book "The Photographer's Eye" covers all this ground in a much more practical and far less 'arty' way. It's well worth reading.
