Half the rows of bricks reflect normally when I render the file below.  The
other half reflect at an odd angle.  Is this WAD?

#include "colors.inc"
#include "finish.inc"
camera {
 location <0, 2, -3>
 look_at  <0, 1,  2>
}
union {
 plane { y, -1.5 }
 plane { -z, -15 }
 pigment {
  // solid pattern for use in texture/pigment/normal(/density)
  // brick pattern generates a brick wall like structure
  brick
  color Gray,          // color of mortar
  color Red            // color of brick
  brick_size <2,1,1>   // size of brick    (optional)
  mortar     0.2       // width of mortar  (optional)
 }
 normal {
  brick 0.5
  brick_size <2,1,1>   // size of brick    (optional)
  mortar     0.2       // width of mortar  (optional)
 }
 finish { Glossy }
}
light_source { <2, 4, -3> color White }

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