# Coordinate System

Open Beam Interface uses a coordinate system that is 0-indexed and starts in the top left corner of the scan. The default coordinate system can be rotated or flipped with [configurable transforms](../config.md#transforms).

```{figure} https://cdn-learn.adafruit.com/assets/assets/000/001/264/large1024/lcds___displays_coordsys.png
Source: [Adafruit GFX](https://learn.adafruit.com/adafruit-gfx-graphics-library/coordinate-system-and-units) documentation
```