Wasn't it beowulf who wrote:
>here is the whole scene:
...
>#declare c=1/180;
>#declare a=144-2 + clock*c;
>#declare b=256 - 2+ clock*c;

It just so happens that this particular polynomial looks the same when a
and b change from 142,254 to 142.006,254.006. POV is animating it
correctly but it doesn't happen to move.

In general, you'd expect most polynomials to look pretty much the same
when you change a couple of parameter values by 0.004%.

-- 
Mike Williams
Gentleman of Leisure

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