War Zone Obstacle #4

This in an obstacle that can be used in a K'NEX war or for anything else that you might use it for. WARNING: This is mostly for looks! This is really just used for showing a boundary or area for a bunker, base, etc. This is not supposed to be used for actually blocking something!
I just made these to show the most piece efficient way to make war zone obstacles!

Step 1: What You Will Need

You will need:
8 gray rods
1 blue 3d thing (forgot what it is called sorry)

Step 2: Putting It Together