TECHNICAL DRAWING: This drawing is called Again by artist Henry Moore. I am not to sure what the medium used in this but it kind of looks like pen but in saying that I like the way he has used cross hatching to define the drawing of the his own hands.
In the we defined psychology as the science of mental life. Then heading into the we changed the definition to the scientific study of observable behavior. And today, we define psychology as the science of behavior and mental processes.