Invisible wrote:
> It's more that, in everyday life, there is no way of turning light into 
> either electricity or magnetism. I'm sure theoretically it must be 
> possible somehow, but it's not something you typically observe.

Solar panels. Infrared remote control receivers (i.e., photodiodes). Optical 
sensors on doors.

> Presumably knowing the *colour* of an object still requires you to 
> compute electron energy band gaps and weird crap like that though?

Yes.

-- 
   Darren New, San Diego CA, USA (PST)
   The NFL should go international. I'd pay to
   see the Detroit Lions vs the Roman Catholics.

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