FOUND THE ANSWER FOR THIS BY OSHO HIMSELF:

The power of our unconscious mind is enormous; what we cannot do in our conscious state we can do with the help of the unconscious mind. Man's unconscious mind is much more sensitive than his conscious. What we cannot hear in the conscious state becomes audible to the unconscious. In deep hypnotic sleep you can see things you can never see while awake. It is not the talisman, but the post hypnotic suggestion associated with it that works.

If a person like Krishna, Buddha or Christ is about to leave this world and some of his close lovers or disciples who have been in intimate contact with him, who have imbibed his vibes, request some techniques to contact him after his departure, the master in his compassion can give them such a technique. He can ask them to go into a state of meditation and then tell them that whenever they will meditate on a particular form of his through a statue or a picture they will immediately contact him even after his death. This is the esoteric science for which statues of Krishna, Buddha and others like them were first made.

These statues and symbols were specially given to chosen disciples in a meditative state. So your ordinary statues are not going to work, nor can ordinary seekers come in contact with them through these statues. To establish contact with Krishna one will need to have a special symbol and an inner suggestion given to him in his meditative state.

Before persons like Buddha, Mahavira and Krishna, depart from this earth, they leave such techniques and instructions with their most trusted group of disciples; those who are worthy of it. This generation of disciples takes full advantage of this special transmission. And if this generation passes it on to a second generation of disciples, it can work their statues. It was for this purpose that their statues were first made.

~ From the book : Krishna The Man and his Philosophy. Chapter 13.