As near as I can tell, this is how Mr. Doke does it (Photo #1). I removed the lens to make the placement of the thumb more obvious. Rotate your wrist 180 degrees and you can now photograph the whole world with your left hand. Needless to say, without automatic exposure and focus this technique totally impractical unless you plan to make all of your shots at the same distance and under the same lighting conditions. This is what you'll look like from the subject's point of view (Photo #2).
|Photo #2 Updated November 15, 2014|
In defense of what credibility I may (or may not) have, the quick shot of my hand was made outside my office, completely without pretense. No effort was made to create "art".