I'm making a wall of boxes (yes, boxes). I have made a set that I could tile
(like bricks). What do I need to do to repeat this group of objects sevreal
times?

Also, how does the sky sphere work? Someone told me how to get a two-color
sky sphere:

sky_sphere {
  pigment {
    gradient y
    frequency 1
        color_map {
      [0 color rgb <0,0,0> ]
      [1 color rgb <0,0,2> ]
    }
    scale 2
    translate y
  }
}

Why is the scale 2? Why is the sphere *translated* on y (not rotated, etc)?

Thanks for your helpfulness!

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