# Fixtures

Fixtures are objects representing individual autonomous agents in Schéma.

They can map directly to physical lights, smoke machines, objects in the visual output or just be used internally in the Schéma program (Virtual).

Each fixture contains and processes its own [Block Stack](/guide/blocks/stacks.md).

Fixtures are placed in 3D space by double clicking and selecting in the [Schematic view](/guide/views/schematic.md).

![](/files/-LeHSFkLy33o6Zo8EPQ2)

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# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.scenic.tools/guide/actors.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.