# Why Run the Same Transformer Again?

## Post copy

A carry travels one position per round in a worked binary-addition example. Follow the same rule across changing states, then ask what a recurrent Transformer must learn.

## Attachment and alt text

Image: `assets/05/cover.en.png`

Alt text: Conceptual comparison: one timeline consumes new input tokens; another applies a shared update repeatedly to the same input.

![Conceptual comparison: one timeline consumes new input tokens; another applies a shared update repeatedly to the same input.](../assets/05/cover.en.png)