Try to render the little animation below and you will see the Ghost of POV
effect caused by union and wood normals (name made up by Uwe Zimmermann I
think). 10-20 frames is enough to get the idea.

I still wonder what actually causes the weird effect.

Can any of the programmers explain it?

camera {
   location y/50
   angle 150
   look_at 0
}

light_source {100*y, color 1}

#declare X = clock;

#declare Y = pow(10,X*2-1);

plane {
   y, 0
   pigment {color 0}
   normal {onion 1.5*Y sine_wave scale 1*Y}
   finish {ambient 0 diffuse 0 phong 1 phong_size 300}
}
// Also try to rotate the effect... It's impossible!

Greetings,

Rune S. Johansen

---
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