Cool Optical Illusion Collection #4

Missing Piece Illusion

What about this missing piece to the puzzle...

This puzzle will take you a long, long time to figure out. The shapes are the same size, yet when moved around they cover the same surface area, EXCEPT for the obvious missing hole in the lower right corner.

To really appreciate a magic trick, you have more fun not knowing. I think this is an optical illusion that I'll let you figure out the secret yourself if you really want (there's a simliar illusion on this website), but I won't explain it here. You'll go on the rest of the day thinking about how this could possibly happen.

Go ahead, count the squares one by one, get out a ruler and measure each piece. Must be magic!