Orchid XP v3 wrote:
>>> And when I start up the engine of my car, the various parts move far 
>>> too fast for the eye to follow. But you *can* see the blur of moving 
>>> objects, and there is little doubt that they're moving. ;-)
> 
>> Why do you think that those frequencies are far above 50 Hz?
> 
> My engine *idles* at several thousand RPM...
The significant character here is 'M'
> 
>> What sound does your motor make? Can you find the base frequency on 
>> your keyboard?
> 
> Surely that's just the resonant modes of the exhaust system and the chasis?
> 
Whatever it is, that is what you see. If it moves faster than 50 Hz you 
either see it not moving at all or, viewed in the right direction, as a 
semitransparent surface. If you can prove that you can see something 
moving at, say 200 Hz, I have a couple of friends working on the retina 
that would be most interested in such a physiological anomality. ;)

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