If you study Japanese art you see a man who is undoubtedly wise, philosophic and intelligent, who spends his time how? In studying the distance between the earth and the moon? No. In studying the policy of Bismarck? No. He studies a single blade of grass. But this blade of grass leads him to draw every plant and then the seasons, the wide aspects of the countryside, then animals, then the human figure. So he passes his life, and life is too short to do the whole.