Impossible case

<p> The magician shows the spectators a tiny briefcase. He puts it down on the table, opens it up, and produces a full size real golf ball from it. The golf ball is much bigger than the brief case, and it seems impossible that such a large ball could be produced from such a thin case.</p> <div> &bull; The plexiglas briefcase measures cm 10 (l) x 2,5 (h) x 6 (w).</div> <div> &bull;&nbsp;Only the briefcase is supplied. You can produce various objects from it as long as they are the correct size to work with the case.</div>