The Retention of Vision Vanishing Trick
The Trick
In this trick, the magician places a coin or small object between the fingers and the thumb of the right hand. The left hand is palm up with the palm slightly tilted towards the audience. The right approaches and displays the object on the left palm for a second or so, held on opposite sides of a diameter. Then the right hand moves away empty as the fingers of the left hand close over the object. After a brief pause the left hand is shown empty and the coin has disappeared.
How
The secret here is that the left hand never took the object in the first place. The right thumb slid the coin into right finger palm as the left hand fingers closed. This is done by bringing the right hand second and third fingers level with the first while the right thumb slides the coin away from the finger tips and to the base of the fingers into finger palm.
A good example of it here.