Here's a slightly different take on 'em, an in-camera double exposure.
http://www.fotocommunity.com/pc/pc/cat/3536/display/3456161The in-focus part was shot according to the light meter, the out-of-focus one was 1 stop overexposed.
*istD with FA-100/2.8 macro. Most happy to read comments on this experiment. Thanks for looking.Jostein