When a concept depends on itself.

In artwork, this often takes the form of the [b]Droste effect[/b], in which the image contains a smaller version of itself within it, and that smaller version contains an even smaller version, and so on.

Can also refer to other forms of self-reference.

h4. See also

* [[clone]]
* [[fractal]]
* [[mirror]]
* [[recurring image]]
* [[recursion]]
* [[Tag Group:Image Composition]]
递归 再帰