Interesting...
"Inuit hunter Silas Sandgreen made this map for the Library of Congress in 1925. The map represents the Crown Prince Islands, in Disko Bay, on the west coast of Greenland. Sandgreen carved driftwood to signify the islands’ landmasses, painting the material to mark areas of rocks and vegetation. The driftwood is sewn to sealskin."
http://www.slate.com/blogs/the_vault/2014/01/08/in...