A more and more interconnected world is raising walls and fences to keep out those it considers undesirable. The number of physical barriers between countries that existed in 2001 was 17: the figure has presently jumped up to mote than 70.

Some of them reinforce borders. Others divide the same population. Some seek to stop the refugee flow. Others hide poverty or inequality.

The construction of the walls is the most obvious sign of the rise of ultra-nationalism, xenophobia and intolerance, in an increasingly unequal world.

This project shows how these barriers impacted the lives of people and communities on 4 continents.