It is presentation which lifts the card trick from the level of the commonplace puzzle to the status of an unforgettable and inexplicable mystery.
Magic is the illusion which is created when a series of natural movements apparently causes an unnatural, or magical, result.
Genuine magic demands on perfect simplicity of execution.
If the actions used in performing sleights are visible or even suspected by the onlooker, the whole illusion of magic is destroyed.