Active / passve - pentagrams, can anyone explain? Options

I just recently read somewhere about active and passive pentagrams.

the passive were you imagined as bluish colors and thast about it.
the active ones you traced in appropriate color (maybe red for fire or whatever) and also maybe placed the sign for fire in the middle of it.

Can anyone elaborate and explain more about this? I've used different techniques with and without these conditions but never figured anything about passive or active about them, just used however i felt like, so if anyone could explain more about this i could play more with rituals that require these.

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Thank you both Nero and Fox.

Nero
Yes Nero, that helps alot, thank you.
As for wheter they are active/negative that was a part of my slack self that wanted an answer without thinking myself, i apologise.

Only active, passive considering spirit, ok, got it.

Fox
Thank you, i'll wait (IMG:style_emoticons/default/smile.gif)

OOoh, i'll go click some ads straight away, my way of saying thanks for having a nice forum/site. (cheers kinjo (IMG:style_emoticons/default/laugh.gif))