The Jigsaw Of Jodysseus

In a cell next to that of Sisyphus in the kingdom of Hades was locked an alchemist called Jodysseus who, as a punishment for his hubris, the Gods presented with a jigsaw made of thousands of pieces.
"When you have completed the ultimate Jigsaw of everything then you may leave Hades", said Hades.
And so the man struggled for a whole year, with all his energy and determination, to complete the Jigsaw and when atlast he put the final piece in place he said to the Gods proudly, "I've finished".
"Finished?", asked Hades, appearing in his cell, "Finished what?".
"Your jigsaw puzzle", said the man grinning.
"Oh but that wasn't the whole puzzle", said Hades with an even broader grin, "That was only a piece of a piece of a piece of a piece".