Escher Puzzle?

Here's a story: I was looking at jigsaw puzzles, thinking which one would generate the least "what the penguin!?" reaction if a sane person would randomly receive it. I was thinking seriously at getting something with pieces count on the order of 2000 or 3000 before noticing large, framed finished puzzles on the wall and asked how many pieces are they; they're the ones with 2000-3000 pieces, and they're HUGE.

Okay, if I would get one of those, at beginning of 2009 there's a chance I'd be crowned that one mister who ruined someone's holiday because he spent it all assembling a penguined puzzle, so I got a smaller one. That's not the end, of course.

As I was deciding which scenery is the prettiest and hardest to assemble, little boxes at the other end of the store caught my eyes: Ball puzzles, their complete form is a sphere. Now, I just have to try building one of these. My vote was for one with pictures of some of M. C. Escher's works (one of the most potent flummoxative agent known to civilization) on it. Here it is:

The pieces:

This puzzle can't be too hard; the pieces have numbers on the back, see:

I know, blurry picture and all. Believe me, those little black specks are numbers. With that fact in mind, I proceeded with a plan. After all, to fail to plan is to plan to fail.

It's good strategy, not lowly cheating.

Half assembled. By this time I began thinking: They really should make a death star version of this kind of puzzle, I'd hang it above my bed!

Very soon now, very soon.

Here it is. The picture is 'Relativity'. The other side below has 'Day and Night'

My only qualm is that it ends too soon. Anyway, this is not a Gundam kit, I can disassemble and reassemble it anytime with little to no remorse. Yippie?