In the midst of unfathomable tragedy it is often the image of a single child that brings home the full horror of a conflict, crisis or disaster.
Like Phan Thi Kim Phùc, the nine-year-old Vietnamese girl running naked down a road after a napalm attack in 1972.
Or Birhhan Woldhu, the starving three-year-old Ethiopian girl who sparked the Live Aid efforts in 1985.