"Hideki Yukawa's mind throughout his life remained very much an oriental one. We learn that of the ancient Chinese writings that he discovered early in life, the ones that made the greatest and most lasting impression on him were those of Taoism in general and of Chuangtse in particular... this school centre on man's relation with the world of nature, and his oneness with it. ... To Yukawa the awareness of nature in a much more intuitive way than any Westerner would accept as part of scientific thinking appeared to be a vital ingredient in creativity. He felt not only that his own success in moving theoretical physics a step further owed something to this way of thinking, but that an element of it can be seen in such creative acts as Heisenberg's formulation of the uncertainty principle."