This infamous origami model can best be described as a paper version the water balloon. The completed model is inflated and then can be filled with water, if desired. Another option is to simply leave the cube empty and use it as a decorative object.
As with any origami project, make sure that your work surface is hard and flat. This will give you the sharpest creases, which will give you a more accurately folded model. It is also important that you start with paper that has been cut into an exact square. If the dimensions are off by even a very small degree, your model may not fold correctly.
You can use any paper you like for your model copy or typing paper will work well. If you decide to make your model for display, you may want to explore some more colorful paper options. Paper made especially for origami is available. It is two-sided (white on one side and brightly colored on the other) and comes cut into squares. You don’t really need to splurge on paper, though. Any sturdy, colored paper will work.
- Position a square of paper on your work surface, white side up (if using two-sided, origami-style paper) so that the edges are facing up and down, left and right.
- Bring the left edge over to meet the right edge. Crease and unfold.
- Bring the top edge down to meet the bottom edge. Crease and unfold.
- Turn the square over and position it so that its points are now facing up and down, left and right.
- Bring the left point over to meet the right point. Crease and unfold.
- Bring the top point down to meet the bottom point. Crease and leave folded.
- Grasp the left and right points of the resulting triangle and push inward. This will cause the model to collapse along the folds you just made. The result will be another triangle shape with folded flap sticking out from the back of the model and another sticking out from the front.
- Fold the front flap to the left and fold the back flap to the right so that your model will lie flat. Position your model so that is flat against your work surface and the open end is facing toward you.
- Bring the lower-left point of the top flap up to meet the top point. The bottom left edge of the top flap will be brought up to lie along the center crease. Crease and leave folded. Repeat with the corresponding lower right point and lower right edge.
- Turn the model over and repeat Step 9. You should now have a diamond-shaped model in front of you. It is worthy to note that Steps 9 and 10 create the hole that you blow into in order to inflate the model. If you place each lower point just to the outside of the top point, then you will create a bigger hole. This may make inflating the model easier later on.
- Bring the left point of the top flap of your model over to the center of the model, Crease, and leave folded. Repeat with the right point of the top flap.
- Turn the model over and repeat Step 11.
- Bring the left top point of the model down to meet the center point of the triangular left flap the point that was brought to the center of the model in Step 11. Crease and leave folded. Repeat with the top right point and the triangular right flap.
- Turn the model over and repeat Step 13. With each fold in Steps 13 and 14, you will have created a small triangular flap that is positioned above a larger triangular flap.
- Bring the top right point of the small left triangular flap you just made into the pocket of the larger left triangular flap. All of the small triangular flaps should be enclosed within that pocket. Repeat for the small right triangular flap.
- Turn the model over and repeat Step 15.
- Inflate the model by blowing into it through the bottom hole. It might help to place your fingers over the folds made in Steps 15 and 16 while inflating.