Wasn't it Warp who wrote:
>  I tried a different approach to blurred reflection. Didn't work extremely
>well (which isn't a surprise knowing the algorithm...). Sorry for the PNG,
>but I didn't want JPG artifacts to destroy anything, and it isn't that big.
>
>  Now you can start guessing how I did it. As you can see, I did not use
>antialiasing (I deliberately rendered the image without antialiasing to show
>that I did not use the antialiasing trick). And yes, I rendered it completely
>with POV-Ray 3.5beta in one run (ie, I did not use any external programs, just
>POV-Ray and one single .pov file).
>  You can also watch for what is wrong in the reflection... Something that
>just cannot be corrected with this technique :)

My guess would be that there's a complicated optical illusion going on
here. Somehow the sphere is very much larger and further away than it
appears, and those reflections aren't reflections of the other objects,
but of a different set of similar, but larger, objects.

Could we be looking though an elliptical hole in the chequered plane?

The blur is achieved through focal blur.

There may be a small no_image sphere in the foreground which casts the
shadow.

-- 
Mike Williams
Gentleman of Leisure

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