This story appears in the January 2018 issue ofNational Geographic magazine. If birds left tracks in the sky, what would they look like? For years Barcelona-based photographer Xavi Bou has been fascinated by this question. Just as a sinuous impression appears when a snake slides across sand, he imagined, so must a pattern form in the wake of a flying bird.
In the January 2018 edition of National Geographic Magazine, the Barcelona-based photographer Xavi Bou documented the “footprints” that birds leave in the sky over the course of 5 years, in this beautiful exposition.