Photography is all about light; about capturing how and where, and the intensity with which it shines.
In the montages here, two shots of the same view are overlaid. The first shot was in focus, showing trees silhouetted against the sky. The second shot was out of focus, reducing the image to blob and bokeh.
The difference between the two montages is largely an effect of the intensity of the light electronically shone in the editing process.