Andrew Coppin wrote:
>Right, well, I suppose I was a bit vague...
>
>I visited the London Science Museum one time... They had this plastic stuff.
>Apparently they make scale models of bridges and stuff out of it to analyse
>stress. Coz, the thing is, when you view it through this clear plastic sheet
>(which probably polarises or something), and when you bend it, the most
>stressed parts show up rainbow colours. (The lightsource might be "special"
>too - it was in a dark room.)

Funny that you should mention this now.
I posted such an image a few days ago to
a photo forum here in Norway.

Here's that image:
http://foto.no/cgi-bin/bildekritikk/vis_bilde.cgi?id=49527

I shot the image here in my living room
about a year ago (IIRC) with a macro lens,
a halogen reading lamp and two polarizing
camera filters (one in front of the lamp
and one on the lens.)


Tor Olav

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