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### The Background

The `background` feature is used to assign a color to all rays that don't hit any object. This is done in the following way.

      camera {

        location <0, 0, -10>

        look_at <0, 0, 0>

      }

      background { color rgb <0.2, 0.2, 0.3> }

      sphere { 0, 1

        pigment { color rgb <0.8, 0.5, 0.2> }

      }

The background color will be visible if a sky sphere is used and if some translucency remains after all sky sphere pigment layers are processed.

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