The most beautiful Mac ever? No, but it's a close thing!
How do you make sure all the parts fit correctly in a new design? You test "shoot" the mold with clear plastic before the mold is textured.
At Apple, some of these test shots were built until finished and given to key team members as awards for a job well done.
You may still buy a nice poster.
After much research I have learned that no more than 10 of these clear Macs were ever built.