Hardly anyone has used the octant map/projection since 1514 or so. At least it is hard to find examples.

So I put it to use in the Art of Geography logo.

Many people have commented on the logo… I thought it would be interesting to delve into this unusual projection/map. The following article explains more about Leonardo da Vinci’s octant map and projection:

http://www.artofgeography.com/info/octant-projection.html