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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It has to do with the 5 points of the pentagram.
Each point is asociated with one of the four elements.

I will try to make an image of it, because its hard to put into words.

Thank you, i await with anticipation. (IMG:style_emoticons/default/wink.gif)

As for the one element for each point, i know this.

It's just that i read on OF somewhere that sometimes you do an active pentagram for earth (or fire or whichever) and sometimes you do it passive, it depends on what and how you use.
And when he used the passive it was just plain and when it was active he put the earth symbol in the middle of the pentagram and traced it (in his mind) with appropriate color.

and, i dont understand whats active and passive about it, thats why im asking