Ok - time to trot out my ignorance in public :)

Why does it seem to be required to have an emission media to have a
scattering effect in the atmosphere?

For example - putting the statement

media {
      scattering {3, 1.0 }
      }

into the scene results in utter blackness - despite the fact that one would
expect the scene's 5 spotlights to show up as scattered beams of light.

However, place

media {
      emission 1.0
      scattering {3, 1.0 }
      }

into the scene - and now there the beams show up fine - but as _darker_
bands in the general whiteness of the emission media.

So what don't I get here? :)

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