"In the beginner's mind there are many possibilities, but in the expert's there are few." People say that practicing Zen is difficult, but there is a misunderstanding as to why. It is not difficult because it is hard to sit in the cross-legged position, or to attain enlightenment. It is difficult because it is hard to keep our mind pure and our practice pure in its fundamental sense. Via zen coloring book we can learn how to keep our focus on the important things and how to achieve our inner greatness.