In chapter 4, we've added assets to Brushfire for the start of chapter 4. Therefore, it's necessary to clone the chapter 4 repo named brushfire-ch4-start before starting the chapter. Similar to the chapter 3 hub, the chapter 4 hub also has an ending GitHub repo named brushfire-ch4-end. If you'd like to see what the project looks like by the end of chapter 4 or you want to use it for the start of chapter 5, clone this repo.