How to Fold an Origami Waterbomb Base

Easy level, 5 steps. Traditional base. Earliest record: Li Tre Trattati (Giegher), 1639.

The animated version shows each fold moving, one step per screen. This page shows every step at once.

All 5 steps

Step 1. Start white side up. Fold the top edge down to the bottom edge.
Step 2. Fold the top left corner down along the diagonal, then unfold.
Step 3. Fold the top right corner down the same way, then unfold.
Step 4. Push the left corner in between the layers along the crease. This is an inside reverse fold.
Step 5. Push the right corner in the same way.
Done. This triangle is the waterbomb base. The waterbomb, the jumping frog and the tulip start here.