Step 11: Fold the outer ‘wings’ inwards to meet the centre fold line, taking care to only take the top layer of paper
Step 12: When pressed down your paper should look like this
Step 13: Turn the paper over
Step 14: Repeat step 11, folding in the outer ‘wings’ to inwards to meet the centre fold line
Step 15: Your paper should now look like this
Step 16: Fold the inner corners upwards and outwards along the crease lines indicated in green
Step 17: Your paper should now look like this
Step 18: Fold the new wings back down
Step 19: Raise the inner wings outwards and open up their inners
Step 20: Once the inner wings are opened up your paper should look like this