Thinking about it, we need to either lose the recursive balls, or make
them larger. At the moment, because they are so small, unless you zoom
in they look like a display glitch.
On the other hand, if they were made larger, it would be necessary to
make some tweaks to account for e.g. interreflection and caustics. So
it's probably best to do without.
The single sphere just looks really darn cool anyway. No sense in
overkilling it. ^_-
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