Air Max was just about the biggest game-changer in athletic footwear history. When Nike design legend Tinker Hatfield opened that window into the sole, he set the Swoosh on the cutting edge for good. Inspired by the radical architecture of Paris’s Pompidou Centre, visible air had the world scratching their heads and trying to work out what the trick was. But seeing really is believing and Air Max has become an unmistakeable icon on the streets the world over. Here are some numbers to celebrate the see-through shoe’s legacy.