1. |

Crease paper both ways
diagonally. Open up.
(the white is the back of the paper)
|
2. |

Fold each corner to the middle.
(the gray is the front of the paper) |
3. |
 
Fold each side to the middle. |
4. |

Fold both the top and the bottom to the middle. Crease all side
well. |
5. |

Open up all folds but the first ones. It will look like step 2
but with extra creases. |
6.
|
Open up the top and the bottom.
|
7. |

Hold the corner marked A, and
push it up and in to the center. Shaping the corner using the
crease lines as a guide. |
8. |
Repeat for the opposite corner. |
| 9. |
Fold
point B up and in to the middle of the box. Use the previous
creases to continue the shaping.
Point B will end up meeting the two points from the sides. |
10. |
Repeat from step 7 with the opposite
side to finish the box. |