Butterfly Map: Waterman Equal-Area Butterfly Projection Map of the Earth: Atlantic View. Sale Priced Postcard.
Back of card reads: Steve Waterman, a self-taught theoretical nuclear physicist, created a 14 sided polyhedral map in 1996 based on close sphere packing theory.
The equal area version of his map was refined by a team of mathematicians and cartographers in 2006. You can interactively rotate the Waterman Globe at: www.watermanpolyhedron.com/CART5.html