Basic Form Eight:

1. Crease a square piece of paper twice diagonally .
2. Fold both lower edges so that they meet at the midline.
3. Fold upper edges so that they meet at the vertical midline.
4. Fold form together at the horizon line.
5. Unfold steps 3 & 4. Lift corner A up, then pull down and flatten.
6. Repeat with corner B. Flatten Folds.

This is Basic Form Eight