Walking the line

The Mexico-US border is once again the subject of much discussion in the wake of Donald Trump's inauguration and his subsequent repeated insistence that a wall - whether entirely physical or partially invisible - will be built to separate the two countries and prevent illegal immigration. Alessandro Grassani's photos should serve as an indicator that people can't simply stroll into the US, as some foaming-at-the-mouth right-wingers would have you believe - and a timely reminder of the desperation and dedication of some of those who make the long journey to the border, hoping to be able to make it across.