" Adding depth and dimensions"

"The ball is dropped" by Laurence Nacario- Canon EOS M, ISO 800, Shutter 1/40, F- stop 2.0, Grayscale.

" Rock...Paper...Sand?" by Laurence Nacario - Canon EOS M, ISO 100, Shutter 1/800, F- stop 4.0, "Cloudy".

One thing I have noticed about having a nice focus/blurring effect is that the subject you are focusing on DEMANDS attention. It literally stands out because you directed it to do so. I also like to call it "3D" looking. If you watch the old 3D movies with the red and cyan glasses you may realize that the focus is on the object "popping out of screen". I believe having a strong focus on a subject while blurring/flattening the background, gives it a 3D like quality. It is also a good technique to use for isolating or separating objects. For example, the rock photo above is separated from the sea shells behind it because it is in focus or it is within the lens's depth of field.