This plane needs to be made 'hollow' for the media to appear:
      plane {z,  2... }

That's because the spheres are located 'inside' it. (The same effect could be
achieved by using 'inverse' instead.)

Whereas, the plane{y, -2...} doesn't need the hollow keyword, as the spheres are
'outside' it.

Personally, I have always wondered why a z-plane doesn't have it's 'outside'
facing the -z direction by default, rather than the other way around. I suppose
that there are old and deep reasons for this.

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