I only have a single sphere to which I applied the Glass texture and it just
appears as black. I've followed other "transparent object" tutorials and
they appeared as black too. I've tried raising max_trace_level but that
didn't help.

/////////////////////////////
#include "colors.inc"
#include "textures.inc"

light_source {
  <0, 25, 5>
  color White
}


camera {
  location <0, 0,-2>
  look_at  <0, 0, 0>
}

global_settings {
  ambient_light
//  max_trace_level 100
}

background {
  Gray80
}

sphere {
  0, 0.5
  texture {
    Glass
  }
}
//////////////////////
In case it's useful, I'm using Version 3.6 on WinXP SP2.

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