Psychology of magic

"Cards are the poetry of magic." Pick a card, any card. You may think that you have a free choice, I mean, what are the chances of choosing that one card that I have in mind.You may choose a card, I could put it in the middle of the deck and misplace that card by shuffling. What the general public doesn´t know is that I am controlling that card the entire time, keeping track of it at all times. If I were to do a mindreading trick, I could place that card at the bottem of the deck and then take a peek. That way, my spectaters can shuffle the deck and I can tell them which one it is.