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.

Line Shapes Variation Group Sample Spirograph3D 1

Line Shapes

Shape variations made from lines. Like all shape variations, they ignore the input. Some are generated using parametric equations. Others use algorithmic techniques.