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.
Tag: julia3dz
Crackled Julia3Dz Rings 2 Rev 1
Creating great Julia shapes with crackles based on a flame by Bart Doetsch