Your brain has the unique ability to 'draw in' what isn't really there.
You may be fearing photographs of machines because you expect there to be infrasound there, sort of like an arachnophobe jumping out of their skin because they've seen a tomato stalk out of the corner of their eye.

I'm not saying "one note of infrasound and you'll be shitting your pants, buddy", but it is know to cause unease, at the very least by the film industry. Wiki cites Irreversible, but I'm willing to bet Event Horizon probably uses it too. I think it exists, and this is b3ta, not /., so there's no point getting into a deep discussion, but I've heard Lustmord (a dark ambient band known for using infrasound to disorientate people) and it works on me.
( Shegetz Chris Kamara's comedy moustache, Fri 11 Apr 2008, 13:12, Reply)