> Is it an optical illusion or an animation - the fact that the whole thing
> looks like it's "contracting" when you stare at it?

Hmm, I wouldn't have recognized this unless you've mentioned
it.
It's a still png and I doubt that it can convert itself into
an animation (which would be fascinating) so it must be a 
playing of the brain. :-) An Interesting effect anyway, it was 
definitely not intended. It could relate to the ground patter which is not
a perfect checker board pattern but has shifts in it. I'll post the ground
patter later, unfortunately my newsreader (PAN) does not support posting
binaries so I have to switch to the web interface.

Regards,
Sebastian

P.S.: Now Steve's post makes sense...

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