scott wrote:

> Must admit I never tried that, I was more interested in what happened 
> when the fan was lit by only a CRT in a dark room.

That's tame; try holding a 250 Hz tuning fork up to a CRT. Hint: it 
makes a difference whether you hold it vertically or horizontally. ;-)

The thing the cat is demonstrating is that if you talk into a set of 
spinning fan blades, you get a weird kind of phase shift effect as the 
sound reflects off each fan blade. (There's probably a Dopler shift in 
there too.) It's really quite neat. Makes a very stroby sound.

-- 
http://blog.orphi.me.uk/
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