Taking suggestions from clipka on my original submission, I have updated
my CGSphere take on Sam Benge's Matryoshka interpretation of Shay's CSG
Challenge.  I deepened the gold color, made the finish more metallic,
and improved the DOF.

Shay's CSG Challenge:
<https://news.povray.org/povray.binaries.images/thread/%3C51ef197a%40news.povray.org%3E/>

My original rendition:
<https://news.povray.org/op.w4qoqbyl6b35ac%40linux-dc58.site>

DOF in both submissions was simulated by stacked multiple renders,
because POV-Ray’s native focal blur was taking too long.  For the
original Sam’s Shay, the camera position was jittered, yielding a focal
point rather than a focal plane; in this redux, the camera position is
sheared with respect to the focal plane.

Photons pass:     1:05:46
Radiosity pass:   2:48:56
Final pass:       7:45:36
Frames stacking:  0:00:05
                 --------
Total:           11:40:23

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