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Modular origami

Modular origami is folding many identical simple units and slotting them together, without glue, into a larger geometric shape such as a cube, star or ball.

Each unit is usually quick to fold and has pockets and tabs. Tabs slide into the pockets of neighboring units, and the friction holds the structure together. The Sonobe unit, which assembles into cubes and other polyhedra, is a well-known starting point, and the traditional Japanese kusudama, a decorative ball made from many folded pieces, is closely related.

Consistency matters more than speed: if units differ slightly in size or crease position, the assembly strains and pops apart. Fold all units from paper of the same size and thickness, crease them identically, and assemble on a table. Small 7.5 cm squares are popular because models often need a dozen to thirty or more units.

How to make a simple modular model

  1. 1

    Choose a model with a simple unit; the Sonobe cube needs only six.

  2. 2

    Cut or buy squares that are all exactly the same size and thickness; 7.5 cm squares suit a small cube.

  3. 3

    Fold the first unit slowly and keep it as your reference.

  4. 4

    Fold the remaining units identically, comparing each one with the reference.

  5. 5

    Assemble on a table: slide the tab of one unit into the pocket of the next, following the diagram.

  6. 6

    Close the last units gently, easing the tabs into place rather than forcing them.

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Common mistakes and how to fix them

  • The model pops apart

    The units differ slightly. Fold them all from identical squares and crease them exactly the same way.

  • The last tab won’t fit

    Loosen the neighboring units a little, slide the tab in, then press the whole structure together evenly.

  • The colors end up in the wrong places

    Lay the units out by color before assembling, and follow the diagram’s color plan unit by unit.

Good to know about modular origami

Modular origami suits people who enjoy assembly as much as folding. Each unit is quick to make, so a cube can be finished in a quarter of an hour, while polyhedra with thirty, sixty or more units become weekend projects. Color planning adds a puzzle of its own, such as arranging three colors so that no two neighboring units match. Modular models also work well in classrooms: each student folds a few units and the group assembles one shared model. The Sonobe unit, credited to Mitsunobu Sonobe, is the classic place to begin. Once you can build a cube with it, the same unit makes larger shapes such as Toshie's Jewel from twelve units and a stellated icosahedron from thirty.

Modular origami: questions

Does modular origami use glue?+

Traditional modular models hold together by friction alone, with tabs in pockets. Some large kusudama use a little glue or thread, but simple models do not need it.

What is a kusudama?+

A traditional Japanese decorative ball made from many folded pieces, originally used to hold incense or petals. Many modern kusudama are modular origami.

What paper is best for modular origami?+

Standard kami or copy paper cut into identical squares. The paper should be crisp enough to hold the tabs firmly, because very soft paper lets units slip apart. 7.5 cm squares are the usual size for cubes and small polyhedra.

Related folds and bases