You probably already carry a Sharpie marker, why not carry one that can DEFY GRAVITY at any time? And it does it without any threads, wires or magnets!
You can use it as a quick bit, suspending it from your fingertip. Hand it to the spectator they are unable to do it. But you can do it with a pen they just examined!
Or you can perform a complete suspension illusion with the Anti-Gravity Sharpie and a couple of playing cards.
It's like a mini-illusion show that fits in your pocket!
