Modular origami, also called unit origami, requires two or more pieces of paper. The paper is folded into a shape called a "unit" or a "module". Many units are assembled together to form the final origami model.
The best modular origami models have the following features:
- Units are easy to fold
- Units can easily be assembled
- finished model maintains its shape without glue or tape
- finished model is pleasing to the eye.
["FIT" by Tom Hull; photo by E Westcott]
Some units, like the Sonobe unit, are versatile. The number of units used, and the way the units are assembled can change the appearance of the final model. Charles Esseltine's TSU can also be assembled in different ways. [Photo: "TSU" octahedron by C Esseltine]