>> And except when the Sun is exactly overhead, little sunlight 
>> shines directly onto it.
> 
>   That's an exaggeration.

Well, the picture doesn't really show it, but the cylinder is quite 
tall, so there's little direct illumination at the very bottom except 
for a narrow range of Sun angles.

Of course, the marble is quite light in colour, so there's plenty of 
ambient light... I'm not sure how fussy Oak is about this sort of thing.

-- 
http://blog.orphi.me.uk/
http://www.zazzle.com/MathematicalOrchid*

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