> ## Documentation Index
> Fetch the complete documentation index at: https://docs.worldlabs.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Variations

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In Marble, you can **upload an image** to generate a 3D world. Once the world is created, you can modify the background by adjusting the **seed** for randomized variation, or by editing the **World Guide** for more precise control.

### 1. **Change the seed**

* Go to **Settings** in the bottom-left corner.
* Adjust the **Seed** value.
* Each new seed introduces **randomized background variations.**
* Example: changing the seed might transform a wall into a hallway or shift lighting.

👉 ***Try it: change the seed, hit Generate, and see what new background variation appears.***

### 2. **Edit the World Guide for more control**

If you want more **precise control** over what appears in the background, edit the **World Guide** directly.

* This lets you refine elements beyond random seed changes.