Impossible Puzzle Blocks (3171)

You show a puzzle concisting of a number of blocks which form a perfect
square which fits in the supplied frame, there is no room left in the
puzzle or frame.

You take away the frame and put it aside. Then you shuffle the blocks.
Now you take an EXTRA piece out of your pocket and add it to the puzzel
to again form a perfect square! Then you again shuffle the puzzleblocks,
take an even larger extra block and again make a perfect square out of
all of these blocks.

Then you take the frame again and it still fits perfectly around the puzzle! Everything can be examined.

The videodemo of this effect starts at 2.25 min. We supply the blocks & frame, the box with drawer is not included.