On the highline my thoughts are simple and clear," says pioneering rock climber, BASE jumper, and wing suit flyer Dean Potter. "Fundamental needs shine through the mental clutter. I focus completely on my breath, my connection with the line, and making it safely to the other side."

This highline was set up on the summit of Cathedral Peak, in Yosemite National Park, at an elevation of 10,911 feet. Though Potter is untethered, he is in control. "I’ve always been a 'free soloist.' Whatever I do, I long to be untethered and free," notes Potter. "I am completely confident with my ability to catch the line if I were to fall. I’ve practiced this catch move successfully for the past 19 years."