Exploring the cultural significance of Indigenous rock art and its history. Rock art--etched in blood-red lines into granite cliffs, boulders, and caves--appears as a beguiling, graffiti-like abstraction. But, the petroglyphs and red-ochre pictographs found across Nlaka'pamux territory in present-day British Columbia and Washington State are far more than ancient motifs. Signs of the Time explores the historical and cultural...