Step-by-Step Instructions

1. Score Your Paper Into a 3×3 Grid

• Score vertically at 2¾ in and 5½ in (7 cm and 14 cm).

• Rotate 90° and score again at 2¾ in and 5½ in (7 cm and 14 cm).

Now you have a grid with 9 equal squares.

2. Cut Out Two Squares

• From the top row, cut out the:

• Top-left square

• Top-center square

You’ll now have two flaps that open and one back corner that stays upright.

3. Fold the Flaps

• Fold the side flaps downward so they fall open when the box is revealed.

• The remaining upright corner becomes your decorative “wall” or display background.

4. Decorate the Inside

• Add a photo, message, or artwork in the middle square.

• Use the flaps for notes, stickers, or journaling.

• The upright corner is perfect for adding dimension or a little surprise.

5. Lid

• Cut a square that’s ⅛ in (0.3 cm) larger than your base:

• → For 8¼ in, cut an 8⅜ × 8⅜ in (21.3 × 21.3 cm) square

• Score all sides at 1 in (2.5 cm)

• Cut slits on opposite sides and glue into a lid shape

Want to Add a Surprise Centerpiece?

In the video for this Half Explosion Box, I added a mini paper cake. Want to try it too? Check out my tutorials here: Mini Paper Cake

Final Tips

• Secure the upright corner with double-sided tape if needed

• Use foam squares or pop dots to add height to the center elements

• A belly band or ribbon can help hold the flaps in place if you don’t use a lid

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