Answer:
You saw me where I never was and where I could not be. And yet within that very place, my face you often see.
Look into my face and I'm everybody. Scratch my back and I'm nobody.
Often held but never touched. Always wet but never rusts. Often bits but seldom bit. To use it well you must have wit.
This is in a realm of true and in a realm false, but you experience me as you turn and toss.
A man calls his dog from the opposite side of the river. The dog crosses the river without getting wet, and without using a bridge or boat. How?
What did the piece of wood say when he saw the screwdriver and screws approaching?