> > In other words, for the Invisible Man to be transparent while in air by the usual rules of physics, he'd have to be no more complicated than a giant single-celled amoeba. He'd only become mostly "invisible" if he took this amoeba form and hid inside water. :-)
>
> Well thats the point. Water isn't invisible, it is transparent. The Invisible Man isn't transparent (which is partialy visible at the edges) he is invisible, meaning he breaks the true laws of physics.
>
> Speed'deffinitionsareeverythinginSci-Fi'ball

It depends how the invisibility works. Maybe "unnoticeable" would be a better definition, allowing you to avoid all the issues mentioned. (But raising new ones, of course. Heh.) The invisibility would come from somehow altering the perceptions of the observer rather than the physical state of the invisible person or object. You could be looking straight at it all day - deliberately looking for it, even - but not notice it.

Not being of scientific mind or training, I have no idea how this could be done. But I'm pretty sure *somebody* knows how to do it, because they keep doing it to my car keys.

Brunnen-"Douglas Adams called it a Somebody Else's Problem Field"G