Valley fold such that the top of triangle is aligned to the black line. This will be the same folding if we apply the valley-folding along the red dash-line shown in the step #15.
The One-Eyed Doe Fable
A Doe had had the misfortune to lose one of her eyes, and could not see any one approaching her on that side. So to avoid any danger she always used to feed on a high cliff near the sea, with her sound eye looking towards the land. By this means she could see whenever the hunters approached her on land, and often escaped by this means. But the hunters found out that she was blind of one eye, and hiring a boat rowed under the cliff where she used to feed and shot her from the sea.
