Simple maps are almost as old as any other form of graphic representation. Some Paleolithic artworks have been interpreted as maps, usually to hunting grounds. The Aboriginal Australian cultures paint pictures of animals from "The Dream Time" with circles and lines that form intricate maps to waterholes, periodic rivers, and other family groups. The truest hallmark of early mapmaking began at the same time as water travel did, however. With the advent of seafaring, men now had to create maps showing location without reference to any land features other than coastline! Of course, the stars could be used, but only at night, so that during the day leaving the coast meant being lost in featureless territory -- fatal for a sea captain. Indeed, the first sea maps (as with the Polynesian peoples) used stars as reference points. Later maps would use a coordinate system to locate one's position in the deep sea. 