Parisians awoke to the sound of birds tweeting, children laughing and an unfamiliar smell in the air on Sunday as the city implemented its first ever car-free day. The event was a hit on social media and a window into an alternative future, with Parisians sharing thousands of images and stories about how different their city felt. The event came a day before the release of a groundbreaking report entitled “Urban Mobility at a tipping point” from global consulting firm McKinsey & Company which spoke about the new technologies and business models contributing to the quest for better, more efficient urban mobility.