On Thu, 22 Jun 2000 11:31:02 +0100, "Ian A. Nichols"
<I.A.Nichols@xxxxxxxxxxxxx> wrote:
>
> Another property of endoscopes is that they exhibit enormous depth of
> field. This has been exploited in the past by natural history film
> makers to show, for example, a snail, close-up, but with people in the
> background still in focus.
Then, they show the film backwards in order to show the entire digestion
process of the snail from leaf to, um, ....
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