My host, Patricio Rios, led the convoy all week long, so I spent a lot of time hanging out the window of his Suzuki Sidekick, looking back and taking pictures similar to this one. Most of the Atacama lacks vegetation, and it rarely if ever sees rainfall, so Chileans don't worry about staying on established trails. Every direction you look is available to drive in. Tread Lightly! simply doesn't exist. As you might expect, this concept was rather difficult for me to grasp.