Jamie Kraft is mot oly the photographer, but a scientist, too! His approach to photography is multidimensional! And his special interest are lenses and their optical possibilities. 

The image "Distant Stars" below, demonstrates the use of selective focus, sharpening the main subject, while blurring every other part of the image, usually background! There are mamy excellent bokeh images on Lighthunters site, but this particular one is worth of serving as example what of bokeh power and it's creative use!