Invisible Zone TENYO

The magician takes a pen and insert it through the Invisible Zone case.
Both ends of the pen can be seen protruding from both sides of the case.
When the case is opened, the center 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!
When Lubor Fiedler decided to create a product idea for Tenyo, he undertook the challenge of creating a trick that uses everyday objects. The object he selected was a ballpoint pen.
After performing this trick, Lubor Fiedler himself also hands out the case, the spring, and the pen to different people for examination!
He removes the gimmick from the pen and removes the pen cap, displays it, and explains, "This is a magician's pen"