Available from http://www.world-of-magic.co.uk 
What an ingeniously  simple  but phenomenally deceptive principle This is a strong effect on its own  or as supplement to any magic production. The performer shows a flat stained wood panel that has vividly colored card pips engraved into it. He unfolds the panel to form an empty square box  and sets it on a thin solid wood base. Then  he shocks his audience when he reaches into the previously empty box and produces a large silk. Even the performer seems puzzled so he removes the box from the base  flattens it  reopens it and places it back onto the base. With a few magical gestures  he is able to produce more silks and even spring flowers or bills  
This works on a different principle that is really intriguing and effective  
Show panel and base on both sides.  
Open panel and set on base to form a box.  
Immediately remove items from box