15.
Fold four corners.
(Previously we folded and then drew a line. But here we want to do in reverse. Do you know why? The reason is we will not unfold the four corners).
Prepare to apply a mountain-fold.
16.
Apply the mountain-fold of the step #15.
I wrote your name in the sky, but the wind blew it away. I wrote your name in the sand, but the waves washed it away. I wrote your name in my heart, and forever it will stay.