A form of cartographic projection developed by Buckminster Fuller. The world is mapped onto the faces of an icosahedron. The orthogonal projection from the (near) sphere of the Earth to the equilateral triangle faces of the icosahedron is carefully chosen so that the faces may be cut apart and laid flat without separating any land masses from one another. It's hard to describe immediately, but this projection does emphasise that every landmass on the Earth is relatively close to at least one other landmass.