The Plains tribes have a long tradition of pictorial history, first through petroglyphs and pictographs and later through painted buffalo hides. These hides were adorned with colorful art that told stories, depicted visions, and recorded history. But when bison were hunted to near extinction and tribes were forced onto reservations, they no longer had a medium for their pictorial art and history. Book pages, maps, and ledger books became the canvases for images of tribal life. Traditional implements gave way to colored pencils, crayon, and watercolors.