> For the complete documentation index, see [llms.txt](https://courses.prequilt.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://courses.prequilt.com/youtube-courses/intro-to-prequilt-course/02-or-custom-quilt-blocks/02a-or-reverse-engineering.md).

# 02a | Reverse Engineering

{% hint style="info" %} <mark style="color:blue;">**Reverse Engineer:**</mark> To examine the construction or composition of a quilt block in order to recreate a duplicate or similar quilt block.
{% endhint %}

## <mark style="color:blue;">Module 02a | About Reverse Engineering</mark>

Before we can get started building out a custom quilt block (in this case - a traditional quilt block, the Sawtooth Star), I'm going to introduce you to the concept of reverse engineering.

**Reverse engineering** is to examine the construction or composition of a quilt block in order to recreate a duplicate or similar quilt block.

***

## <mark style="color:blue;">YouTube Video</mark>

{% embed url="<https://youtu.be/xvCkCXISuj8?si=dOV4eWMwnUQvBxrm>" %}
*Module 2a: A Tidbit on Reverse Engineering*
{% endembed %}

***

## <mark style="color:blue;">Help Guide</mark>

In preparation for reverse engineering a block (like the Sawtooth Star):

1. Breakdown the block into a grid.

   <div align="left"><figure><img src="/files/CjT4yNW6RK3P739C2xs4" alt="" width="387"><figcaption></figcaption></figure></div>
2. Analyze the block and break it down into its components.

   * There are 4 small white squares, 4 flying geese, and 1 large black square.

   <div align="left"><figure><img src="/files/jI5kmVdPcNaCPhgQpsfW" alt="" width="375"><figcaption></figcaption></figure></div>

With is knowledge, we can now recreate the block in PreQuilt.