It seems to be a by-product of ramp_wave.  Adding sine_wave makes it
disappear, but there also seems to some strange things happening with
onion near the origin.  I found something really cool trying this out
though.  Check this out:

camera {
   location <0, .01, 0>
   look_at 0
}

light_source {100*y, color 1}

plane {
   y, 0
   pigment {color 0}
   normal {onion 1.5 sine_wave}
   finish {ambient 0 diffuse 0 phong 1 phong_size 300}
}

Oh, and render this one big and stare at it for about a minute. :)

camera {
   location <0, 20, 0>
   look_at 0
}

light_source {100*y, color 1}

plane {
   y, 0
   pigment {color 0}
   normal {onion 1.5 sine_wave}
   finish {ambient 0 diffuse 0 phong 1 phong_size 10}
}

While you are looking at it, think about this - You are getting very
sleepy...your eyelids are getting heavy...when you awaken you will cluck
like a chicken.

-Mike

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