“I carry my thoughts about with me for a long time, often for a very long time before writing them down. I can... be sure that... I shall not forget [a theme] even years later. I change many things, discard others, and try again and again until I am satisfied: then, in my head, I begin to elaborate the work... the underlying idea never deserts me. It rises, it grows. I hear and see the image in front of me from every angle.” - Ludwig Van Beethoven (quoted by Hamberger 1952).
A MUST read to understand visual thinking persons...
Via Gust MEES, João Greno Brogueira