Step 11: Fold the left and right corners of the triangle upwards until they meet the top point
Step 12: Fold the bottom of the paper up to meet the bottom edge of the triangle
Step 13: Fold the left and right sides in to meet in the centre
Step 14: Repeat step 12 by folding the bottom of the paper up to meet the bottom edge of the triangles
Step 15: Fold the left and right inner corners down to meet in the centre
Step 16: Unfold these new folds slightly
Step 17: Unfold the bottom folds
Step 18: Lift the top layer of paper upwards and outwards
Step 19: Pull the left and right sides outwards whilst pushing the inside upwards
Step 20: Fold the left and right points downwards towards the centre