A piece of 15*7.5cm colored paper, divided into 6 equal parts.
Fold the left side as shown in the picture.
Turn over to the back and fold upward as shown.
Fold the two corners inwards as shown.
Fold the bottom edge upward as shown.
Expand it into a triangle as shown in the figure.
The top is also folded as shown in the picture.
Put the top corners inside as shown.