>> 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.

Infrared receivers *respond to* light. They do not actually *transform* 
it into electricity.

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

Damn. :-(

-- 
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