Xander over at BotBench has a great post on the inner workings of the official LEGO Color sensor.
He took to it with a knife to explore the insides and how it works.
I won't spoil it, but there is a fantastic little twist at the end so read the whole thing :)
via BotBench - http://botbench.com/blog/2011/09/16/exposed-lego-colour-sensor/
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