Impossible Penetration Stage Size

A frame and a plate with a hole is shown.

The plate is raised and a spectator's arm is inserted in the hole. 

The plate is then pressed and miraculously passes through the arm. 

When the plate is released the arm is seen to have penetrated the hole on the plate. 

It's impossible! 

The 12 X 14 inch frame is made with great care and finished very well.