Authagraph is an approximately equal-area world map projection invented by Japanese architect Hajime Narukawa (鳴川肇) in 1999. The map is made by equally dividing a spherical surface into 96 triangles, transferring it to a tetrahedron while maintaining area proportions, and unfolding it onto a rectangle. The map substantially preserves sizes and shapes of all continents and oceans while it reduces distortions of their shapes, as inspired by the Dymaxion map. Triangular world maps are also possible using the same method. The name is derived from "authalic" and "graph".
The method used to construct the projection ensures that the 96 regions of the sphere that are used to define the projection each have the correct area, but the projection does not qualify as equal-area because the method does not control area at infinitesimal scales or even within those regions.
The Authagraph world map can be tiled in any direction without visible seams. From this map-tiling, a new world map with triangular, rectangular or a parallelogram's outline can be framed with various regions at its center. This map provides a decentralized world view. The map projection tries to reflect an infinite multiverse perspective that is intended for the understanding of global phenomena in the 21st century. The projection is useful for tessellation and thus allows for depicting temporal themes, such as a satellite's long-term movement around the earth in a continuous line.
In 2011 the Authagraph mapping projection was selected by the Japanese National Museum of Emerging Science and innovation (Miraikan) as its official mapping tool. As of 2015 it is used in official Japanese high school text books. In October 2016, the Authagraph mapping projection won the 2016 Good Design Grand Award from the Japan Institute of Design Promotion.