How to Fold a Modular Origami Star

If you have mastered the basic origami crane and the paper boat, and you are looking for a project that is a little more mathematically satisfying, it is time to enter the world of Modular Origami.

Unlike traditional origami, where you use one single sheet of paper to create a sculpture, modular origami requires you to fold multiple, identical, simple shapes (called "units") and then physically interlock them like puzzle pieces to create a much larger, complex structure. You do not use any glue or tape; the tension of the folded paper holds the sculpture together.

The absolute best beginner modular project is the 8-Pointed Transforming Star (often called a Transforming Ninja Star). It is brilliant because it is kinetic—it slides open to form an octagon, and slides shut to form a sharp star. Furthermore, because it requires 8 separate pieces of paper, it is the ultimate project for playing with color palettes!

The Supplies You Need

This project is highly forgiving, but to ensure the star slides smoothly, you must use the correct paper.

8 Sheets of Square Paper: Do not use heavy cardstock or construction paper; it will be too thick to assemble. Standard origami paper (kami) or standard printer paper cut into perfect squares is best.
The Color Palette: You have 8 units. Standard choices include:
- The Duotone: 4 Red sheets and 4 Black sheets (alternating).
- The Rainbow: 8 completely different, bright neon colors.
- The Gradient: 8 shades of blue, shifting from dark navy to pale ice blue.

Part 1: Folding the Single Unit

You must repeat this exact process 8 times to create your 8 units.

The Creases: Take one square of paper. Fold it in half horizontally and unfold. Fold it in half vertically and unfold. You should have a cross crease (+). Now, fold it diagonally both ways and unfold. You should have an 'X' crease.
The House Mates: Fold the top two corners down to meet the center horizontal crease, just like you are starting a classic paper airplane. The top of the paper should now look like a house roof.
The Fold-in-Half: Fold the entire piece of paper in half along the vertical center line, wrapping the "roof" flaps to the inside. You should now have a trapezoid shape.
The Parallelogram Push: Look at the bottom, square-edged side of your folded paper. Using the diagonal creases you made in step 1, use your finger to push that square edge inward, collapsing it inside the shape.

Your finished unit should look like a parallelogram with two "points" on one end, and an opening (like a tiny pocket) on the other end. Repeat this 7 more times.

Part 2: Assembling the Star (The Tricky Part)

This is where the magic happens. You must lock the units together using only paper tension.

The Lock: Take Unit A in your left hand (holding the closed points) and Unit B in your right hand (holding the open pocket).
Slide the closed points of Unit A deeply into the open pocket of Unit B.
The Tuck: Look closely at the top of the pocket on Unit B. You will see that the tips of Unit A's points are sticking out slightly past the edge of the pocket. You must fold those tiny overlapping tips down and inside the pocket of Unit B to lock them together.
Repeat: Take Unit C. Slide Unit B's closed points into Unit C's open pocket, and tuck the tips.
Continue this process, building a large ring of colored paper.

Part 3: The Final Connection (Closing the Ring)

Closing the star is the hardest part, as the tension of the paper will fight you.

When you have connected 7 units, you have a C-shape.
Slide the final Unit (Unit 8) onto Unit 7.
Now, carefully bend the ring so that the closed points of Unit 8 slide into the open pocket of Unit 1 (the very first piece you folded).
Carefully tuck the remaining small overlapping tips to lock the ring completely shut.

You should now have a large, circular octagon with a hollow center.

Part 4: The Transformation!

The star is built. Now it is time to play with it.

Gently hold the outside edges of the octagon with both hands. Slowly push inward, sliding the units along their hidden tracks. As you push, the hollow center will close, and 8 sharp, colorful points will slide outward, instantly snapping into a lethal-looking (but safe) paper star!

To reset it, simply pull gently on the outer points, and the star will expand back into the hollow octagon.

Conclusion

Modular origami proves that incredible complexity can be built entirely out of very simple, repetitive actions.

By taking 10 minutes to fold 8 simple parallelograms, you can assemble a kinetic, highly colorful 3D toy without touching a single drop of glue. Try making one with a heavy, dark academic palette of burgundies and navies, or a screamingly bright neon rainbow, and enjoy the mathematical magic of the transforming star!