‘Just as I reached the car, the woman appeared in her red coat’: Stéphane Arnaud’s best phone picture

The French photographer on an inspired, instinctive moment on a street in Portugal

That fraction of a second in which everything happens at once? That's what this photo is all about," Stephane Arnaud says. The global photo editor-in-chief for Agence France-Presse was in the Portuguese city of Coimbra for work, walking up a whitewashed street, when his eye was drawn to the red central caps on this car's wheels.

They were the only brightly coloured element on the whole street," he says. But just as I reached the car, this woman appeared, in her red coat."