What can I do with a normal pass?

Hello,

In wondering what the normal pass can be used for? It looks as if there's a million nifty things one could do with it, but I never found anything "comprehensive".

Thanks

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you can use it to create a mask for grading/applying effects/... either use the r,g,b channel or a combination of them or a keyed color from them

you can use it to do some basic religthing

you can create other passes from them (with the camera date you can create a facing angle pass)

you can create a basci enviroment reflection effect

and probably a dozen more things