Take a square sheet of paper, fold in half sideways to make a crease and unfold.
Fold the paper in half downward.
Fold the upper corners to meet the center line.
Fold the upper layer of the bottom part upward.
Fold the corners outward.
Fold the upper layer of the bottom part upward below the center line.
Fold the rest of the flap upward along the center line.
Fold the bottom part backward.
Open the helmet.
The samurai helmet is complete!