One aspect of art may be called imitative art, the tendency and ability to produce as exactly as possible, on the canvas or in the clay something which one sees. This is the first stage, and one which leads the artist further on the path of art. In order to develop this faculty the mind must be fully concentrated. When the artist lacks concentration he cannot observe objects and their beauty keenly, and therefore he is not able to reproduce them exactly as he sees them. Concentration has such great power that a concentrated person can penetrate into an object, and can see not only the outside of it but also the inside. In other words a concentrated person not only sees the form but its spirit. That is the fullness of observation, and it comes by concentration. Whenever the artist cannot imitate nature, cannot copy an object exactly, it shows that he lacks concentration.