Spaces and exchanges
To see the pictures (published in BBC News, on March 28th, 2014):
Alonso Delgadillo paints his murals on homes in Tijuana. He enjoys watching them age over time. In recent decades, many poor Mexican sought to cross the 3000 km (2000 miles) border to the US in search of a job. At one point, more than a million were being arrested every year, but the number has fallen dramatically since 2007.