Mitsunobu Sonobe

Mitsunobu Sonobe emerged as a central figure in modular origami when, in 1968, his “Color Box” cube—constructed from a basic geometric unit—was published in the Sōsaku Origami Group ’67’s magazine, credited to him as “Finished model by Sonobe Mitsunobu”.

Though there was early ambiguity about whether Sonobe invented the module or assembled an existing design, correspondence and accounts confirm that he indeed devised the foundational module now bearing his name.

Over the 1970s, the Sonobe module gained traction across publications and creatives, becoming the building block for modular origami. Its elegance and ease of assembly allowed folders to experiment endlessly—forming cubes, stars, and polyhedra composed of dozens or even hundreds of units. Today, the Sonobe module is celebrated as the heart of modular origami, credited with inspiring a transformational era in papercraft.