Step 1:
Fold aluminium foil around a white paper.
Prefold over both lines.

Step 6:
Repeat steps 3 to 5 on the other triangle, see arrow.

Step 5:
Fold the edge in half over the purple line, do the same on the left, see arrow.

Step 2:
Fold over these two lines, all three parts have the same width.

Step 4:
Mountain-fold the triangle in half.

Step 3:
Fold over this line.

Step 10:
Valley-fold on the tip of the triangle, see short line in the center. Then fold the edge of the triangle to the edge of the model, see arrow.

Step 8:
Prefold.

Step 9:
Prefold.

Step 7:
Fold over these two lines and turn the model.

Step 16:
Use tape or glue to connect the edges

Step 15:
Fold both corners inwards.

Step 12:
Press flat, see arrow.

Step 11:
Mountain-fold over the two purple lines in the middle.

Step 14:
Fold the corners into the direction of the arrows. And fold the model in half.

Step 13:
Turn the model again.

Step 18:
Fold both parts in half.

Step 17:
Pull outwards.

Step 19:
Bend both parts and glue/tape them together.