Fold in half and unfold Divide each part in half Turn over Bring the existing mountain folds to the center Turn over Fold the top edge down Unfold Repeat on the bottom Valley-fold (no reference point)...
20cm x 20cm Fold and unfold along the diagonals Fold the edges to the crease and unfold Valley-fold vertically and unfold Note the reference points Fold the top corner down Mountain-fold in half...