> For the complete documentation index, see [llms.txt](https://docs.scenic.tools/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.scenic.tools/block/pick/alternate.md).

# Alternate

Alternates between children Blocks based on a given time duration or manual input.

It's possible to randomize both the picking and the duration.