"Bald Eagle" <cre### [at] netscape net> wrote:
> I'm sure everyone has seen this at some point:
>
> When you look at a light source's reflection on a smooth piece of glass or metal
> or plastic, the scratches all tend to appear as a series of arcs and lines
> roughly in a circular pattern centered around the "hotspot".
>
> I was wondering if anyone has ever attempted to replicate this effect, and
> perhaps has an optical explanation for why the scratches appear in a circular
> pattern.
This effect is the base for "scratch holograms"!! Have a look at
http://amasci.com/amateur/holohint.html
igmar
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