Germany's Quirin Herterich raised his arms, presumably at the passing cable car, as he walked the line during the Highline Extreme event in Moleson Peak, western Switzerland, last Saturday.
Fifty of Europe's best slackliners competed in the four-day balancing fest ending on Sunday on six different lines, ranging from 45m to 495m above ground.
Tethered to the rope by a single safety line, these athletes likely have ice running through their veins to mute the tension they must feel to conquer the one beneath their feet.
Last Friday, Samuel Volery of Switzerland walked a line that was 498m above ground.
Attendees who paid €35 (S$56) to take part in the festival had the chance to chat with the wire-walkers, enjoy drinks and tapas in the evenings and, of course, witness death-defying stunts from the safety of ground.