Norman Crowe and Paul Laseau's Visual Notes is a classic text on the art of recording one's ideas and observations in the form of pictures. Drawing and sketching is a very effective method of capturing and then communicating the essence of a person, place, or thing. It is also a key analytic tool for designers as they seek to deconstruct and make sense of what is happening around them.
Our personal experiences in life influence what we see and how we design. Diversity of experience ensures diversity of thought.