"Rock art is the perfect hook to get people thinking about whether and how we're all so different," Woody tells me on the drive back to Carson City. "Only humans do art, and people respond to rock art in emotional ways. It connects you directly with those who came before, and you realize you have something in common with folks who lived here 10,000 years ago. In that way it can broaden how we think about others. That's the power of this art, and that's why we need to protect it."