Reuleaux triangles
... that Leonardo da Vinci drew a world map in which eight octants of the earth were projected onto eight Reuleaux triangles?
... that <a href="./Leonardo_da_Vinci" id="mwAbk" rel="mw:WikiLink" title="Leonardo da Vinci">Leonardo da Vinci</a> drew a world map <i id="mwAbo">(pictured)</i> in which eight <a href="./Octant_(solid_geometry)" id="mwAbs" rel="mw:WikiLink" title="Octant (solid geometry)">octants</a> of the earth were <a href="./Map_projection" id="mwAbw" rel="mw:WikiLink" title="Map projection">projected</a> onto eight <b id="mwAb0"><a href="./Reuleaux_triangle" id="mwAb4" rel="mw:WikiLink" title="Reuleaux triangle">Reuleaux triangles</a></b>?