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Think of tags as like a book index where you find words and which pages they are on, the same principle applies here. Although it's taken a stage further so it might not be the word, but the subject, so for example if you're looking for things to do with fractal gradients for example. A tag may bring back posts with gradient files, as well as posts that discuss gradients, or tutorials about them.

polar

polar Variation Information

Polar coordinates are an alternative to the more common rectangular coordinates that simplifies the math for many applications. In fact, about about a quarter of the many JWildfire variations are based on polar coordinates! Understanding them can help us use these variations more effectively.