Imagine giving the spectator the choice to draw anything on a blank business card which will be signed and lost in the middle of other business cards and then isolated in a opaque envelope.
Despite this impossible situation you will be able to reveal perfectly the spectator's drawing!
A perfect "test condition" experiment!
To perform the routine you will only require some blank business cards and an envelope; it is very easy to set up and can be repeated immediately. Perfect for close up and stage performances.
In the explanation you will also find a bonus presentation for stage performance.