
In 1977 the National Park Service asked Massimo Vignelli to bring order to hundreds of park brochures, each one designed from scratch. His answer was the Unigrid: ten standard brochure formats, all derived from one base sheet and one modular grid.
The system is instantly recognisable. A black band runs across the top carrying the park's name, photography is sized to grid modules, text sits in strict columns, and a second black band closes the sheet. Park staff who were not designers could assemble a brochure that still looked unmistakably like the Park Service.
The Unigrid is still in use today. Nearly fifty years of brochures, hundreds of parks, one grid — arguably the most-printed modular grid system in history.