"It is commonly believed that sleight of hand works because 'the hand is quicker than the eye' but this is usually not the case.
In addition to manual dexterity, sleight of hand depends on the use of psychology, misdirection and natural choreography in accomplishing a magical effect. Misdirection is perhaps the most important component of the art of sleight of hand. Using misdirection, the skillful magician choreographs every movement in a routine so even the most critical and observant spectators are compelled to look where the magician wants them to.
Two types of misdirection are time and movement. Time is simple; by allowing a small amount of time to pass after an action, events are skewed in the viewer's mind. Movement is a little more complicated. A phrase often used is 'A larger action covers a smaller action.' But care must be used to not make the larger action so big it is suspicious."