Title: Come out and play!
Copyright © 2006 by dV, Minsk, Belarus.

This quite strange "thing" reminded me a ball, so I decided
to dedicate this entry to Belarusian football team
on their thorny road to the UEFA Euro 2008...

Maybe it'a perversion - use raytracer to produce a "graphical" artwork,
which contains no smooth color transitions, no shadows, no highlits and
reflections - no "3D signs", at a first site.
But if one looks casefully, one can break the ice and reach the third dimension!

The main "artistic" trick used is that 'max_trace_level' is reached
during raytracing but we don't pay any attention to this, and so these
fancy black contours that show the space-forms are obtained.
Additionally, we don't need any 'light_source' and 'finish {}' statements.
This makes the code slightly shorter.