There are hot peppers hiding in this dirt, so you build a wall to protect yourself from them. Have you ever stepped on a really hot pepper? The oils bleed into your shoes and burn your feet! You don't want anyone stepping on these so you wall them up.

Once you've got your wall built, you can sit down and enjoy a glass of cabernet (かべ). You're safe from the hot peppers on the other side of the wall, so you can let your guard down and have as much cabernet as you like.