// texture component
// create a tiled texture, alternates between 2 full textures
tiles {
  texture {   // full texture of tile #1
    pigment { agate scale 0.3 }
    finish { ambient 0.2 }
  }
  tile2
  texture {   // full texture of tile #2
    pigment { granite }
    finish { specular 0.3 reflection 0.2 }
  }
}