Earlier, when I was having a problem with the design of
some gear teeth, someone observed that the magenta on
my screen was an indication an incorrectly oriented
triangle in a polyhedron or a hole in an object.
Well, I have found that any sufficiently complex object
can turn magenta on me.
I have another construction that involves many copies of
the same (correctly oriented & closed) polyhedron. There
are different sizes & orientations but they are all either
exactly mated or not touching each other. There is no
interpenetration involved. (It is a fractal scaffolding
So long as there are only a few of them on the screen,
they are all fine. But put too many of them there & they
all turn magenta. Then take away any (not necessarily
the ones you added) & it all turns yellow again.
It is possible that this is a function of the convexity
parameter which is left unspecified. I have not really
investigated it in detail.
But I am fairly sure it would be easy to reproduce.