The magician takes a pen and insert it through the Penetration case.

Both ends of the pen can be seen protruding from both sides of the case.

When the case is opened, the centre of the pen is INVISIBLE!

Wave your hand behind the case since they can SEE RIGHT THROUGH! All they see is a metal spring where the middle of the pen should be…

With the lid open – so the audience still can see the invisible middle – you pull out the pen and the Invisible Zone REAPPEARS FULL VISIBLE!

After performing this trick you can hand out the case, the spring, and the pen to different people for examination!