As Luke says in the explanation, this is an old principle that many have forgotten. For a few bucks
you can remember it.
When choosing a mentalism effect, especially with playing cards, I
always ask myself if I could really read minds is this something I would do? This is one of the few
instances that answer is yes. The premise is simple, you can explain it in one sentence. You are
left completely clean, and you nail it every time. You can learn it in a single pass of the less
than 10 minute video and perform it immediately.
And best of all this is just one way to
use the method. If you need a card really and truly randomly selected but instantly know which it is
grab this.